I don't have the time or enough things I'd like to say in order for it to warrant getting a blog, but not everything I'd like to say fits into 140 characthers either.
It would actually relatively easy for Twitter to fix this issue. Just do it like Reddit does for self-posts. Simply enable people to embed text the same way it lets people embed pictures and videos.
It solves all the major issues Twitter is having - people will stop shortening their tweets so much that they lose their intended meaning/readablity, Google+ stops having a major content advantage due to no characther limit and the feed won't get cluttered by walls of text (unlike Google+).