The moth class is a great example of this transition already taking place in an established displacement class. However, I don't think the moth class was that large prior to the introduction of foiling but there are distinct parallels with the statements and positions of the current a-class sailors "foilers have their conditions", "they won't always be an advantage", etc. etc.
But at the end of the day the floaters are a knife at a gun fight. To entertain the idea of running foilers and floaters together is at the very least is misguided. I think the disruption caused by this injection of technology will take a toll short term and the arms race will keep a significant number of us on the sidelines until the dust settles, if it ever settles.
As a potential downside, crashing a full foiling A-cat at 22+ knots is going to leave a mark on both the boat and driver and let's be honest there aren't a lot of kids sailing A cats.