Look I'm not a Roy hater. I've always loved him, going back to OU days (And I really hate OU but I was a big fan of him). I used to defend his short comings in pass coverage, endlessly, cause I was willing to put up with them for his solid run support and his outstanding hitting ability.
The last two years he's not been the same hitter, at all (even seen him try for the knock out hit a few times this year only to watch the guy bounce off Roy and keep going) and he's not nearly as stellar against the run as he used to be. Now he doesn't just take bad angles against recievers, he's taking them against backs and QBs, he cant get there on the blitz like he used to (People seem angry about the backs stoning him on blitz but it's true. The backs crush him on the blitz and he never gets close now).
Moving Roy to LB simply is not going to work. He's not strong enough, at his size (Specially since he REALLY needs to lose weight from where he is right now just to be in shape and run) which would be, what, if he lost the weight he needs to...220-230 pounds? You really want a 230 ILB who takes bad angles and gets crushed by runningbacks on the blitz, trying to shed 300 pound lineman or 250+ blocking Tight ends?
Sorry I love Roy as much as the next really dedicated Roy defender but he's not a linebacker in the NFL.