I'm worried that people won't reflect well and so (1) they'll decide to use the cosmic endowment for something mediocre and/or (2) they'll have a catastrophic failure in some of {decision theory, bargaining, dealing with threats, reasoning about simulators, acausal trade (including ECL etc.)}. Some angles:
Hmm, I started this post without @Wei Dai in mind, but I seem to just be repeating stuff he's been saying for years. There are other things Wei Dai has talked about and some of them I don't yet grok, so maybe some of them belong on this list too...
I think if you have some people who get the subjective time then I am optimistic that will result in them giving the people who want more wall-clock time more wall-clock time (or to figure out with them some way of augmenting that they feel happy with, if it's not literal uploading).