I don't understand why people think Tom wouldn't have caught on with another team had the Pats or anyone else not drafted him. Case in point, there are posters on this board/media who attended camps saw Brady outplaying the newly signed $100M QB in only his 2nd season. There were also plenty of teams which Tom could've competed early on or eventually taken over in the early 2000's. Tom wouldn't have been able to unseat starting QB's like Chris Chandler, Jeff Blake, Tim Couch, Rob Johnson, Brad Johnson, Shaun King, Steve Beurlein, Vinny Testeverde, Trent Green, Kerry Collins, Jake Plummer, Doug Flutie, Jay Fiedler, Jon Kitna, Kordell Stewart, Chris Weinke? Lots of teams were looking for replacements from guys on this list.
Tony Romo was undrafted and eventually kicked Bledsoe to the curb by year 3.