I think a lot of you guys are underestimating Go because "Awww mobile gaaaaaames".
Ingress became a rather big success after it's launch and is extremely clever. Niantic would do absolutely fine with a second project like this and with both financial and design assistance from both Nintendo and The Pokemon Company it will probably be rather solid.
It's not just a "Go out and catch Pokemon and burn stamina" game like people seem to think it is after the immediate "MUH MOBILE THO" backlash. There's a full game system set up, we see in the trailer that there's battling.
Not to mention it's been confirmed to be one of the leading titles for Generation VI and will link with other games, meaning the hardcore players of the main games will be trying to maximize it's potential like they do with any add-on app launch (Dream Radar, as a recent example)
And lastly, in general, Mobile Game does not equal Bad Game and you shouldn't write something off because of it. Especially nowadays where bigger companies are willing to take bigger risks on our current much better tech.
Probably Master Balls or something.