He had been rumored to be on Milans list as well and Abbiati won't play forever. Also, Juve was said to be interested and Buffon will only play one more season, while Arsenal was interested as well.
If Barca does not sign him this summer I doubt he'll end up with Blaugrana in the short term future, as he'll transfer somewhere else.
I doubt moving to the aforementioned clubs where he won't be the undisputed starter right away, is more appealing than guarding the net of FC Barca from matchday 1. I thought his haste to leave his boyhood club was to seize the rare Barca opportunity. And he's been preparing for this move for a few seasons now. He might as well use a bit more patience, and reflection at this moment. Instead, he seems more concerned with escaping from his parent club, no matter what. Compare it to the reaction from Halil's camp that has been very pro-barca, and want this move to work. And when a player is insistent, something can always be arranged. TS camp seems to have already given up, and I won't be surprised if they're already looking elsewhere.
If he takes up an other option, good luck to him (well, not really
). I hope Barca sign his peer in Leno, raising his profile and making him Neuer's deputy in the process, whilst MAtS ends up as Szczęsny's or J.hart's back-up.