The good young talent is in Europe at age 16 already. Would not even call MLS a feeder league.
Feeders leagues are Belgium, Brazil, Argentina, Netherlands, Austria, Greece and even France can be considered one for most clubs.
But there really is, 15 teams in this league are looking for better goalies for years now. Adams isn't going to find one on the UFA market or trade unless overpaying or you have a goalie that wants to play for the sabres.