Nothing will change with Wenger in charge. You'll in the same place next season as you are now.
I'm not sure about that. We're in a better position now than we were last season, and have made big signings in defense as well as attack. We failed to get Schneiderlin or Carvalho, so our lack of steel in midfield killed us early on in the season. Our winning streak is almost entirely due to Coquelin suddenly becoming top class when he was finally given a chance to prove himself. I still think we'll make a big signing in the DM position this summer, and that might be just what we need to fight for the title.
Don't forget that every time we ended up having to scrape for 3rd/4th, it was because Wenger failed to strengthen the squad while selling a big player every season. Things are completely different now, but let's see if it changes anything.