I hope he gets a shot. I really do. I think he will get a shot and then its up to him.
As for whether he is not good enough to play in the NFL, those that don't think so are not as you describe them. He ran a 4.50 at his workouts before scouts, and that would have been a top 11 time at the combine...he put up a lot of reps of 225, so that was good. He is not 6-0 tall, which is a bit of a hinderance.
His abilities in the return game will get him his shot...then he has to show value as a receiver as well as in the return game to stick. He'll then get the league minimum for three or four years...if he can walk the line during that time, he can have a shot at a second contract.
I'd say the odds of him making an NFL roster are 70% against...again, that's not what I want to see, and I know he doesn't care about that sort of thing...all he wants, and needs, is one team and the right time to offer him a shot...the rest is up to him.
However, for you to say that those who think he won't make an NFL roster don't know what they are talking about is a reach, and jaded from your personal feelings. Quite a few people are pulling for him, but that doesnt hide the reality of the obstacles before him