I've heard of the Metra to Milwaukee proposal too, but I think a lot of political, administrative, and financial hurdles have to be cleared first. It'll probably happen eventually, but later than sooner...
Doth we wish to turn the Hiawathas into some kind of commuter train?
Once upon a time, the MILW ran theirs NON-STOP. Glenview was added only after O'Hare became Chicago's main airport, circa 1960.
Sturtevant was an Amtrak era "inovation".