Why push aldrin to do anything? He can do whatever he wants with his stake. You can rest assured he's going to use it well, no need to blabla in my eyes. Supporting contributions to the project sounds fine.
The system won't work if all the big stakes just hoards a big stake. If he finally does as he said, basically his nxt become dead because it is only sitting there for forging without entering the economy.
If this would be the case, then the initial distribution of NXT to stakeholder is in fact the problem. It was decided to do it the way it was done. There is no way to change the rules now. IMHO, aldrin has every right to do what he want with his NXT - technically and morally.
Apart from that, I think that the system DOES work even when all the big stakes just hoard a big stake. There is still a certain percentage of NXT moving around.
Big stakes will probably not hoard forever. It depends on the price made by the moving NXT, the potential NXT still has (over time) and the temptation of cashing out.
Marcus (small-stake)