The consensus seems to be that SO has peaked some time ago although I still get a lot of value out of it. Why then does nobody seems to think there's an upside to the acquisition? Maybe they can fix some of the problems.
I'm not sure what problems you're hoping they'll solve. I think the biggest problem with Stack Overflow is the endless stream of low-quality questions. It's hard to find interesting, helpful-to-others questions among all the "do my homework for me" type questions, repeats, poorly-worded unresearched posts, etc. That only gets worse as more people use it. I used to moderate, and got sick of it because it's not rewardi…
1) low-quality questions ("do my homework", etc.)
2) over-zealous moderators closing things they don't like
With the vast data SO accumulated maybe some kind of deep network thing? I'm a DNN skeptic but would love to be proven wrong in this case. If someone could extract a quality metric and then add a bot that prompts users to improve the question we'd be a long way towards getting higher quality content.