I think the current version of the motion is in a very reasonable state (for the current situation).
That should not overly concern those who hold equity in Nu which requires much more than exporting dividend keys.
Shareholders seem to be shy, but they are able to vote for this motion if they are in favour of it 
To sum the effect of this motion up in my own words.
First weeks
Tier 4 buy side in excess of $120,000 will be used for PPC dividends and NSR buybacks with ratio 1:2 (5% : 10%).
Next weeks
As long as the tier 4 buy side stays between $80,000 and $120,000 only NSR buybacks will be conducted.
This is supposedly the more effective way to improve the market value of Nu and the motion takes this into regard by preferring it.
I only say supposedly, because Nu so far only had multiple one-time dividend distributions (in different forms: PPC, BKS), while this motion makes ongoing distributions (for some weeks) possible. And even with this motion in place it will be hard to tell the effects from the NSR buyback apart from the effect of PPC dividends; without additional motions, there might be NSR buybacks without dividend distributions, but no dividend distributions without buybacks!
I generally agree that especially with the low market depth of NSR buybacks have an immense effect on NSR price.
If PPC dividends would increase the market depth of NSR (and possibly the value of NSR by creating a continuous demand for NSR) it would be very positive in case Nu comes in a situation where it needs to grant and sell NSR to buy back NBT!
With the current liquidity of NSR you could as well plummet the price as you can boost it with little value being traded.
PPC dividends (potentially) increasing the NSR price - and more importantly the NSR market depth - could pose a benefit that might mitigate the reduced effect of NSR buybacks on market value.
And if that could be derived from the effects of the combination of dividends and buybacks, I would propose an amendment to this motion that always distributes revenue as a combination of dividends and buybacks with a certain ratio:
Future
Even if the tier 4 buy side funds exceed $120,000 again - because a big amount of NBT needs to be sold to the market in a short period of time - NSR buybacks will be conducted with double the value than PPC dividends (10% opposed to 5%).
Like @Nagalim pointed out that means for PPC dividends will always be less than 33% (5/15) of the buyback/dividend pool available.
In case (much) more NBT are being sold, I’d like to see an adjustment of the values ($80,000; $120,000; maybe even the percentages).
I just can’t imagine having a static buffer for a dynamic number of NBT in the wild being sufficient.
That should be something for the agenda as soon as a lot more NBT are in the wild.