babark: Honestly, I'm totally fine with leaving Curse out (and obviously leaving Escape out).
The Curse of Monkey Island may have been a nice enough game, but to me at least, it wasn't Monkey Island.
While CoMI is my favourite game in the series, even if that weren't the case, I'm not sure I'd understand why you think so. I mean, if there's anything that can be held against CoMI, it's the fact that it was arguably far too much of a retread of the first game. So I honestly find it surprising that someone would think of it as 'not Monkey Island.'
As for the main topic, it goes without saying that a serious attempt at negotiating the purchase/licensing of the series wouldn't happen over Twitter, and that this is more Gilbert wanting to stir up the fanbase. But if it did seriously happen, I have mixed feelings about such a scenario. As a big fan of the series, I would naturally be interested in a new game.
However, while I may not have entirely agreed with the direction Telltale took with the series, if nothing else, they did give the series a rather conclusive ending. I'm not sure I'd really want the series to continue on and on, seeing it eventually wither away into nothingness.
Furthermore, while I could be wrong on this, Gilbert seems to be exhibiting an 'auteur'-type attitude. I find this concerning, since many series went down the drain as a result of their 'creators' doing whatever they wanted with it. Plus, as someone who isn't a big fan of retcons, I'm not in favour of the idea of wiping the titles that Gilbert wasn't personally involved with out of existence.
Oh well, this is all just theoretical at this point. An actual project would have to emerge before there would be any serious reason for joy or concern.