Let me start by saying I'm in the camp that hopes to see Brady retire a career Patriot. Whether that happens after this season or years from now, I'd like to see him go out with us. However, I've learned that Belichick is very correct much, MUCH more often than he is wrong, so if he decides to move on, I'll trust him.
But it's very obvious why some fans are intrigued by Jimmy. No, it's not the 6 quarters he played last season, looking great while doing it. It's because if even some of the reports of rejected trade offers are true, the Pats turned down a ton of draft capital for a guy that may never take another snap in New England. Belichick wouldn't do that simply because he thinks Jimmy is a great backup or not capable of taking over the team at some point. The fact that he's still here, and the fact that Belichick still wants him here, is why some think he could possibly be great.
And while Brady has proven to be in incredible shape and there's no sign that he's close to done, we all watched Manning go from best statistical season in NFL history to probably the worst starting QB in the league in just two years.
And while I haven't read every post that inspired you to start this thread, wanting to move on from Tom and wondering if moving on is best for the long term are two very different things.