Disneyland is not about "historical accuracy". No way. Trumpet your disdain for historical inaccuracies all you want, it's never going to be that. It never was.
Main Street is about a "feeling", the innocence and warmth from a small mid-American town that many of us have buried in the depths of our memories and imagination. It has no "time".
Old and young alike, feel it. The old dig it from their past, the young are experiencing it in the present (as they enter Disneyland).
if this means an old times flair to the Starbucks, so be it. It works, go stand in line and see.