You are picturing a future where will hopefully arrive at, thanks to BCE.
But this can hardly be achieved without a transition to it; centralized exchanges are a part of this transition process.
And they will stay a part of the overall business model for some more time - at least until there’s a viable way to exchange NBT (or other stable crypto currencies that might be traded on BCE) to USD or other fiat money conveniently, with sufficient volume outside exchanges.
It allows the BCE funders to stay liquid. They can sell the BKS in case they need to or want to. Plus it offers NSR holders who received BKS as dividends to trade them to whatever they like (in case they don’t want the BKS).
That absolutely right and I bet we will see much less fluctuation once BCE has started its trading and reached a stable amount of revenue. The BKS price will then very likely be determined by a decent price-earnings ratio. Before that it’s a BKS price in hope for a future price-earnings ratio, just like @tomjoad explained:
And that’s the interesting part. Finally we have a Peershares DAC that can be treated like a traditional stock corporation in many ways.
We are currently (still) in the venture capital financing phase (and that’s a good reason for BKS to be already tradable) of an auspicious start-up.
Soon there might be the first working prototype; important steps have already been made (e.g. the reputation system).
But only after BCE is fully up, has passed some tests of fire, did prove itself as stable, reliable, safe & sound and shown how much revenue it can really generate, the price may settle to a relatively stable price-earnings ratio.
Typically the (expected) price-earnings ratio is higher in the early phase (where much is driven by hope) of start-ups and can easily be 100:1 (have a look at Facebook’s early days). It might take years to reach the “stable” price-earnings ratio I proclaimed.
I expect the price-earnings ratio of BCE to be around 20:1 after the second year of operation, but have no clue what that will be in NBT - I will make a bet, though - later… 
This is just speculation - take it with a grain of salt:
close to 185,000 BKS is the total amount of shares of BCE that is (potentially) available; some of them have been sold by BCE, some paid as dividend to NSR holders, some additional to BTC holders will follow.
The total amount of funds raised (according to the last report) is $312,860.
If there would be no hope for value generated by development, the price per BKS should be $1.69. ($312,860/185,000BKS).
Without going deep into the analysis of the operational costs of BCE (development, marketing, reputed signers, etc.), allow me to blatantly claim that BCE will make $10,000 revenue per month or $120,000 annually.
That is close to two thirds of a Dollar per share revenue.
With a price-earnings ratio of 12:1 that would result in a price per BKS of $12*(2/3)=$8. (I admit to have chosen 12:1, because the math is more beautiful that way 
)
I can neither foresee the revenue made by BCE (we don’t even know whether it will be finished, work and be adopted by the masses!) nor the price-earnings ratio the market will attach to BCE.
I hope that the expected revenue and price-earnings ratio is not too far off.
Doubling the price in relation to the last sell price and quintupling it to the current total asset price of BCE should very well be possible.
In the early phase after BCE starts making revenue a spiking desire for BKS driven by a big hope for even bigger revenue can easily ten-fold the price-earnings ratio and subsequently the BKS price.
To answer this question
more precisely:
|---------------|--------------------|
| month | nbt/bks |
|---------------|--------------------|
| 10/15 | 6 |
| 11/15 | 10 |
| 01/16 | 20 |
| 02/16 | 50 |
| 03/16 | 100 |
| 04/16 | 60 |
| 05/16 | 30 |
| 06/16 | 20 |
| 07/16 | 20 |
| 08/16 | 20 |
| 09/16 | 20 |
| 10/16 | 20 |
| 11/16 | 20 |
| 12/16 | 20 |
| 01/16 | 25 |
| 02/16 | 25 |
| 03/16 | 25 |
| 04/16 | 25 |
| 05/16 | 30 |
| 06/16 | 30 |
| 07/16 | 30 |
| 08/16 | 30 |
| 09/16 | 30 |
| 10/16 | 30 |
|---------------|--------------------|
BCE shouldn’t endorse hype, but it can hardly prevent it from happening - BCE would do well not to fuel hype and that’s what BCE has done from the beginning: under-promise and over-deliver!
…or maybe BCE perishes - who knows?
In BCE I see another corporation that offers a combination of doing something good for people and earning money with it; just like the Nu network, but with an easier to grasp business model.
I hope it succeeds. The crypto world is in need of decentralized exchanges that simply work.
Who knows - in some years from now BCE might have become what NYSE for traditional stock corporations already is
