I'm skeptical, honestly. Within the first few months of the acquisition, it seemed pretty clear to my tech-friend group that Twitter was on its way out and was going to fail. But it's been 2 years, and many of those same people still use Twitter quite a lot. Maybe it'll still fail, of course... it'll just take longer than anyone expected.
I was never a big fan of it, and never used it much, so I can't judge any loss of quality over the past 2 years. And since they now require a login most of the time, and I don't feel like logging in, I don't bother clicking through links to Twitter that people post.