As far as 1. is concerned, it currently leaves about 40000 bts /daily available. That is almost 200k USD/month at current prices...
Considering the workers already voted in, it seems more than enough for any upcoming worker.
In any case, the idea is for this worker to function similarly to the refund400k one and have variable payment after all other workers have been paid.
So we expect the community to vote responsibly.