Wittgenstein is like a rock band that abruptly changes style at some point in their career, alienating many of their fans but gaining new ones. One of my philosophy professors used Radiohead as an example, with (I believe) OK Computer as the turning point, but I don't know Radiohead well enough to judge that particular analogy.
I'd agree that the turning point was OK Computer. While that record shows that the turning point wasn't as abrupt as it's often made out to be, OK Computer was the first time a lot of Radiohead listeners went 'huh?!' and either accepted or rejected this new direction. Kid A just affirmed this new direction as more than just some 'influence'.