Yes, I have to agree but I think that the signing of RvP is a reason for the things you mentioned too.
Possibly in terms of mentally but it shouldnt have much affect really, by mentally i mean Van Persie is now the big fish and the best striker at the club after Rooney held that mantle for a few years, but Rooneys never struck me as overly egotistical in that sense, he was happy playing second fiddle for years with Cristiano Ronaldo for instance often playing out wide to compensate for Ronaldos freedom especially in Europe.
Van Persie's arrival really didnt change that much if anything for Rooney, the year before we signed RVP Rooney played mainly in the number 10 role behind Welbeck, he also played there behind Hernandez to, when Rooney first joined he played just behind Van Nistelrooy, and then Saha etc, hes always predominantly played in behind a main striker ever since he signed for us so the arrival of Van Pesie really didnt change all that much, Rooney just shifted to playing behind him instead of behind a Welbeck or Hernandez, granted though the 2 seasons Rooney did play as an out an out striker (09-10,10-11) he scored over 30 goals both seasons, so he can play either role perfectly fine.