Don't underestimate Wenger's ability to ignore the obvious, he's done it many times before. If we get 4th they'll feed us the "signings aren't always the answer", "we'll sign 1 or 2 players super super quality players if we can", "16 years in the Champions League", "the players have one more years experience and I have Diaby, Rosicky, Wilshere, Gibbs etc back" lines and we'll see a carbon copy of the summers we always seem to experience.
Don't get me wrong being above Spurs is great and so is being in the CL, but the problem is that we always seem to be on the same cycle, every season is pretty much the same.