Yes, the number of homophobic comments is worrying. We seem to be moving backwards where tolerance is concerned.
His wife may or may not be suffering, though. It could very well be that she has been happy with the arrangement - it can't have been so dreadful as they have been together for 27 years.
People do come to agreements between themselves that may not be to others' tastes, but work for them.
For all we know it may be his wife who wants to be with someone else and has asked for this announcement so that she can do so without censure. We just don't know, and nor should we.
Whatever people think of PS, this is a separate matter, and whereas he needn't have made it public, he must have had his reasons for doing so, and no amount of speculation about them will bring us nearer to knowing what they were.
One good thing is that when someone popular and famous talks about things like this (or cancer screening, or miscarriage, or domestic violence, or anything that can be difficult for some people to talk about) it gives courage to others by normalising it. IMO this can only be a good thing, and whilst I don't care either way about PS's sexuality, if his talking about it helps someone else to have a difficult conversation then I'm pleased he has done it.