I see zero chance. LOVED his time as a Cardinal, but between his attitude at the end of his tenure with the Cardinals, and the fact that by the time he retires he will have spent less than half his career with the Cardinals, i don't think he deserves it.
Considering only his stats... he was only in Arizona for 7 years, and though his 7529 yards and 44 TDs (12.8ypc) were great and really fun to watch, it's just not good enough considering that Roy Green (12 years in St. Louis & Arizona, 8496-66, 16.3 ypc) and Hall of Famer Jackie Smith (15 years in St. Louis, 7918-40, 16.5 ypc at the TE position!) aren't in the ROH.
(Heck, Ottis Anderson with his 7999 rushing yards / 46 TDs, and Jim Hart with almost 35,000 passing yards and 200+ TDs aren't in the ring!)
I get that the things Boldin has over all of them are that he played in Arizona and was part of turning around the team from perennial doormat to NFC Champions, but i don't think that's enough to overcome his short tenure and lack of numbers (in a much more passing-oriented era) compared to other Cardinals who are not in the Ring.
...dave