1
If you're going to throw 100 fastballs in a row, you're going to see better location than you would pitching normally.
Ichiro could throw strikes, if he were allowed to just throw four-seamers all the time. :- ) It's when you start having to change grips back-and-forth, inside the glove, that things get complicated.
I don't think that the all-fastballs routine is going to hold up. But if the hitters (and the warning-track sprites) let him get away with it, yeah, he could sustain 4 walks a game.