I don't see it being an issue for most guests in the long run.
That said, when we go in December we're doing two days of Epic before heading to WDW. My fam had no interest in hopping over to the other parks (no hate, just wanted to stay at Epic). It could change in the future for sure, but my guess is if folks have limited time & money, they're going to want to spend it at the newest park - at least for now.