I actually don't think it would be that bad. Learning T9 wasn't so hard. And I believe that the muscle memory for typing and swyping is totally different, at least based on my anecdotal evidence:
I've used Dvorak on all my computers for about 10 years, but my phones are still QWERTY. I've tried switching my phone to Dvorak, but found that the typos were much worse (because dvorak clusters all the most used letters on home row, which is close to the "worst" swype layout in the article).
For the times I tried Dvorak on the phone, retraining myself was indeed cumbersome, but I don't think it was too bad. I thought that it would be easier, since I had Dvorak in my brain, but the muscle memory for hitting a key with a certain finger moving a certain direction is totally different from swiping or taping a certain location on the screen.
I'm the same - I have been using Dvorak for twelve years, but that's all about muscle memory with both hands, I struggle to type with it without two hands in place. When I jump onto a colleague's computer I can use QWERTY OK because my brain reverts to the old four-finger typing I used to do. I'm much faster at Swyping on a QWERTY keyboard, though, because it's a different paradigm entirely - it's more about movement than keypress.
I've used Dvorak on all my computers for about 10 years, but my phones are still QWERTY. I've tried switching my phone to Dvorak, but found that the typos were much worse (because dvorak clusters all the most used letters on home row, which is close to the "worst" swype layout in the article).
For the times I tried Dvorak on the phone, retraining myself was indeed cumbersome, but I don't think it was too bad. I thought that it would be easier, since I had Dvorak in my brain, but the muscle memory for hitting a key with a certain finger moving a certain direction is totally different from swiping or taping a certain location on the screen.