Sometimes I'm quick to judge. #Beyond140

Twitter is rumoured to be considering expanding it's strict 140 character limit to 10k. 

Initially my reaction was that this would seriously effect how Twitter looked, significantly changing the user experience.

But after reading more and considering some of the design aspects I'm softening my opinion. I'm warming to the idea, in fact it could make Twitter, the platform I love; better.

Will Oremus on Slate wrote this piece

If I’m right about what’s really going on here, this move will not fundamentally alter how Twitter looks or feels, nor how people use it. Rather, it will change where online content is hosted, who controls it, and who is in a position to monetize it.
“Beyond 140” would essentially drop the requirement that the full story be hosted on some other site. The whole story could now be hosted on Twitter. And instead of a link out and a “view summary” button, you’d see a “read more” button, or something similar, that allows you to read the story without leaving the Twitter app or Twitter.com.

And of course this expanded formate gives Twitter new opportunities to drive ad revenue

Kurt Wagner explains in this article on Re/code

Questions still remain, of course. What might ads tied to hosted content look like? Could Twitter put an ad inside a tweet? Imagine reading a headline in a tweet, expanding that tweet to read an article, and coming across some kind of ad midway through the story or along the right rail.

So to sum up...

People are already posting long form content to Twitter; either as a screen shot or by linking to it published on another platform.

Changing the rules here give Twitter the opportunity to improve the native functionality and user experience of publishing and consuming content within the platform rather than clicking away.

With nice UI, the Twitter newsfeed would not look much different, you'd still have fast flowing timelines, driving realtime conversations.