Earlier quoted context omitted.
if we're lucky, twitter will do what they did with the hashtag and other things when they realised their users needs were 'inventing' new features. The 1/n 2/n n/n tweets is a huge indicator of a feature need. Of course, that's going to dilute their original value proposition of short direct messages.
Twitter started out as an SMS repeater. SMS has for ages, thanks to Nokia, had the capability of merging multiple messages into a single large one. Twitter could just make use of this and save themselves a whole lot of grief.
(Before some smartass replies "I do read over sms", well even without sms merging, twitter could still split a tweet into multiple sms. 99.9999% of their userbase wouldn't care.)