Of Red Sox current players, barring a bad injury Carl Crawford will be a Hall of Famer without question. He has been consistently excellent from a very young age. At this age, he has 100 more hits than Derek Jeter. His hits and SB #'s at the end will be eye-popping.
Ortiz is going to be a close call. I don't think it should be close. He is a HOFer. He has been a star performer for almost 10 years, and most of those years he has been an unstoppable offensive force. The DH thing will hurt him. If he can get to 500 HRs (he'll get close) and be a key component of 1 or 2 more World Series, he'll make it.
AGon will have to put up a string of Ortiz-type (2003-2007) seasons to get consideration.
I doubt Pedroia has a chance, but he has always accomplished things that no one thought he could could do.
It's hard for relievers to make it, but considering that Papelbon has reached 200 saves faster than anyone, he's on the right track. He'll need to be very productive for 8 more years, and he'll have to be dominant for about half of that. A couple of more Championships with him playing a key role will be a big help.
As for past Sox stars, Pedro is a lock. Schilling should be a lock, but he will be borderline. Manny should have been a lock, but the PED busts will be a big issue. Damon's numbers may end up making a good case for him. If he gets 3,000 knocks and with his two World series championships and a boatload of SBs, he'll have an excellent chance.