If Ed Wade ran the Texans, he'd trade Mario to Philly for some 4s and 5s (okay, that was too easy).
Seriously, if Mario can't handle the OLB position in the 3-4 (and remember, kids, I had my doubts) then you move him to 3-4 DE and take what you can get.
But, if someone were to offer Rogers-Cromartie, a 2nd in 2012 and as little as a third in 2013, I'd give it serious thought. That sure beats what we would get in compensation if he goes free agent because he's miscast in a 3-4.
Plus, the more I am seeing of Reid and Watt, the more I want them on the field.