Gesture control will then rapidly be made obsolete by the new Shimano thought control shifting.
One day we'll evolve to a higher state of existence, and simply thinking of a good bike ride will cause some lower-order being somewhere in the universe to go for a good bike ride.
I second what
@ianrauk said, by the way: Tiagra works pretty well, and I've been using it on my commuter bike for years with no problems. It's great when it's newly-installed, too: I just had a very smooth week of commuting, having installed chain rings, chain, rear cassette, new wheels and new brake pads last weekend.