I think his movement is good, he just hasn't had much space to work with as he's played mostly alongside Falcao who moves into similar areas. Rooney has been holding the ball up, linking with the midfield and finding space in the box - all things I see RVP very capable of. I would want to keep him if his wages were lower, but you may well be right about him being happy to play as a number 2, he may just want first team football given his age.
Also, I don't see us signing an expensive out and out striker, but the links to Cavani won't go away. I'd love Lewandowski personally but it would be difficult to play him and Rooney in this system.