My point is that the list of TLDs changes, and I can’t be arsed to subscribe to something which notifies me when I need to refresh the list in my apps. It will also make the regex even bigger than it is now, which I’d personally prefer not to do.
There is also the problem with clashes such as “Hi john.in tomorrow?” – is that http://www.john.in? I think not. It’s those kinds of issues which I believe are not worth the effort of solving for the sake of 7 characters.