If the Model Y has Falcon Wings I definitely won't buy one, and I'll probably sell my TSLA stock too, because it will mean Tesla is being completely stupid.
Even today I believe the FWD's on the X are more trouble than they're worth. The rationale is that they make it easier to access the third row. The Model Y shouldn't have a third row so there shouldn't be any logical reason for it to have FWD's. And on a mass market vehicle they really don't need the added cost. So, basically I'm agreeing with Daniel_R here.
Now, if they do a "Model 3 sports coupe" (as a more affordable alternative to the new Roadster) I could kind of see FWD's on that car, just as a gee-whiz feature. But the Model Y needs to be more sensible.