I don't really agree, he got them to about where a squad that good should be, nothing more. Yes they had a bad start but the mid-table is so crap and tightly bunched you don't need to do much to finish near the top of that group of teams. Even then they could have finished 5th but fluffed their lines and lost to Spuds at Anfield and finished below them. Kenny did nothing special.
It will be harder top 4 next year but that isn't Wenger's fault. Chelsea and now City clearly have far more resources than us. Utd have Fergie who is just brilliant. Those 3 will be the top 3 again IMO so there's only one spot left in the top 4. I'd say that's between us, Liverpool and Spuds. People shouldn't write us off in that little battle, people have written us off before and for all the disappointments of late Wenger has never failed to deliver CL football. This isn't the first time I've seen it said we'll slip out of the top few, we never have before under Wenger and while it is harder now because of Chelsea and now City buying their way in I still fancy us to finish 4th.
All that said I'm not worried about the future 'cos I don't massively care if we finish top 4 anyway. The CL isn't that exciting till the latter stages, it's become too regular, too routine, too bloated and filled with European minnows to be that interesting.