I get the impression that Wells might not have understood the full consequences of time travel when he first went back, hence his adamant desire to keep things on the same course. There's also some wonky things going on with time travel.
1. If Barry went back in time, why aren't there two Barry's running (heh) around? Why did he go back into his own consciousness?
2. If going back in time puts you into your own body, how did wells get back to 11-year old Barry's place since there's no body for him. How does Barry, since there is a body (his own, albeit 11-years old).
Lots of questions regarding Wells' motivations and goals. I hope we get some real insight before the end of the season.