I don’t think so. They can trade BKC for whatever they want to. Once more it doesn’t matter whether they receive BKC (which they can trade for BTC, BKS, PPC, etc), BKS (which they can trade for…) or…
BKC can be sold for up to 1 USD or NBT, respectively.
While BKS might fluctuate. BKC can be expected to be close to 1 USD.
That provides the signers with a more reliable level of payment (in USD value; compared to BKS and BTC) as long as they do their job well and keep their reputation high.
If they’d be paid with BKS and wouldn’t want to keep them to get rid of fluctuating BKS prices, they had to trade them persistently to e.g. NBT.
BKC can be sold for close to 1 USD. Not always and not in times of oversupply, but in the long run BKC are expected to be close to 1 USD - that is one of the assumptions BCE’s business model is banked on. Except for BCE nobody can create BKC. So if BCE is used for trading, that assumption stays valid.
The only drawback is that speculating on rising BKC price level is barely possible - they won’t ever be above 1 USD.
Nope 
The BTC that would be distributed needed to be held available by BCE. BCE would receive BTC for selling BKC (or trade received NBT, PPC, etc. to BTC), because BTC are meant to be distributed to BKS holders.
If they don’t get distributed on a regular basis, but kept to pay the signers, BCE relies on Bitcoin to pay for one of the most important ongoing functions: signing transactions.
I wouldn’t chose that dependency if I had other options.
I think that BTC would be the worst payment option for paying signers - especially considering this:
So no, BTC is not ok, it’s horrible.
Maybe not the best, but still better than BTC. I prefer BKC like I explained above.
While I basically see some danger, I tend to agree with you.
Especially when looking at the amount of BKS that will be distributed to them this way.
And the reputed signers are not necessarily the same people all the time.
The ones with the best reputation will earn the money.
ninjaedit: 3 different people, 3 completely different opinions, lol.