My problem is that the bus factor can't be put aside when it's such a small number, and that pile of "should"s add up to just as much, if not more, uncertainty,

My problem is that the bus factor can't be put aside when it's such a small number, and that pile of "should"s add up to just as much, if not more, uncertainty, compared to Google letting groups living on in a half zombified state essentially forever. At the very least, you have to admit that once you put some thought into it, it's not as cut and dried as "boo hoo Google killed off Reader in 2011 and I'm still salty about it" (which, tbc, I am.)