The main advantage of convincing mainstream AI people that FAI is a problem worth worrying about appears to be not that you will have mainstream AI people thinking twice before they build their AGI, but that you will then have mainstream AI people working on FAI. More people working on a given problem seems to make it massively more likely that the problem will be solved.

If there are rigorous arguments that FAI is worth worrying about, and that there are interesting questions about which people could be doing useful incremental research, then convincing people who work in universities to start doing this research has to be such a massive win than it would take something pretty huge to outweigh it - there are a lot of very clever people working in universities, massively more than will ever work at SingInst, and they already have a huge network in place to give them money to think about the things they find interesting.