You can't really criticise twitter for this - last year they were all ready to launch a way to embed text posts in a tweet like images can currently be embedded in a tweet, until the userbase revolted and they had to cancel the plan.
Really? The twitter userbase actually prefers it this way? That's baffling to me. Did the revolting userbase provide any reasons or explanations for this preference?
I'm not a Twitter user myself, but the character limit is what made Twitter unique. It might be fun to laugh at people who only want to read 140 characters, but we shouldn't assume they aren't going elsewhere to post and read essays. A lot of people use Twitter and reddit/Facebook/HN/ect.