Yeah, but to include in in the MCU they have to go through Phase 3, and that ends in 2019. Unless they're gonna release a F4 film right after Phase 3. But yeah, 10 us too long. A safe estimate is maybe 5 or more.
The problem with the Hobbit movies is that the source material is extremely short. And the fact they even stretched it out into three films is just ridiculous. Though if you don't compare it with the LotR films, it's still quite an OK movie. The acting wasn't bad, but the over-all story kinda fell short.