I doubt this. Here's my reasoning / conspiracy theory:
I heard that the 49ers were interested in McNabb but Philly wants one of our 1st rounders (rumor last week). 49ers of course refused and were willing to give up their 2nd rounder instead. The 49ers hold firm by even stating that Alex Smith is the starter next season during the combine. (but if Singletary is so confident in Smith, why is there no talks of contract extension- because he isn't.)
Philly stills wants a 1st rounder so what do they do? Drive up the asking price by getting another team involved: the Rams who have a higher 2nd rd pick. (essentially a low 1st round pick). Besides higher 2nd rd pick, current Rams OC is Pat Shurmur who was QB coach for Andy Reid, and Spagnuoulo started his coaching career under Andy Reid as well. Simply put, the Rams are just doing Philly a favor.
Plus St. Louis has been more tied to the Vick trades than McNabb.
Some rhetorical questions:
Do you honestly think Andy Reid would trade McNabb to the worst team in the league to finish his career?
Do you think St. Louis would trade for McNabb knowing they are probably 3-4 years away from playoff contention again?
Do you think McNabb would let this happen?