It's a relative proportion. A change in the absolute population will not affect it ideally. Of course, the real world is not ideal, and a heightened reproductive rate in those more prone to autistic offspring could indeed contribute, though not significantly.

Yes, its smaller number now but I know there is an entire town in Oregon that believes this still and refuses to vaccinate.

but pretty much all doctors disagree with this. If you decide to actually look at it instead of blurting out what the media has forced down your throats you'll see theres a bit more to the story. Pretty much all countries have banned the MMR or at least stopped using it, even if it doesn't cause or somehow trigger autism something about it is not right.
TL;DR don't give your kids MMR just give the single M and M shots