Honestly, we will have to wait and see, getting traded may give McNabb the kick in the pants needed to push him to be a big game QB (he isn't out of gas yet, Elway was a year older for example). On the other hand, it may just be a bad big game QB on a mediocre team too. Only time will tell.
In Browns news, Tebow visited Cleveland, if the Browns are smart they will not burn a 1st round pick on him though. Wait till round 2 or even round 3.