I think the impact is more social. People will try to compile world and get failures. Specially people coming from the 4.x branch, where this sort of think never occurred. If this is the only thing preventing a clean makeworld with -O2, I think its worth taking a look at.
It is not true "this sort of thing" never occurred. We have never, ever, supported anything above -O because it has always given trouble.
I've been using freebsd since the 2.x days, I have always compiled world and ports with -O2, and never had any instability issues due to the optimizations. I have switched back to -O and -march=pentium4, the buildworld finished ok.
Lucky you. It does happen that these optimizations may result in code with no apparent problem, depending on one's hardware, though I suspect many people's "hardware problems" were nothing of the sort.
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