Wow, Twitter is collapsing much faster than I expected. With PG and some other high-profile accounts gone, many will loose interest in their Twitter feed fast. Rinse and repeat.
To be clear, it could take years.
But we should remember our own tech-first biases. Twitter ran in frequent-fail-whale mode for months with users accepting that because it fed their social needs. The moment it stopped serving those needs, people started leaving no matter how good the tech is.
I use it primarily as a RSS feed and the occasional "get up to speed with the latest news fast" alternative.