I've said before that I think nothing is better than Play!.
Nothing means it's still sitting there as something they need to deal with eventually, and people can at least pitch ideas for it. Play! was intended as a permanent addition, so if it had opened, it wasn't going to change for a very long time.
It's essentially opportunity cost. Not spending the money on Play! means they could spend it elsewhere (not that EPCOT shows that), and it also means that space is still available for a better idea, rather than now being permanently committed to such a waste of space.
I don't think they intend this as a permanent addition at DHS the way Play! was intended to be at EPCOT. That doesn't mean it won't stick around for a long time (and it probably will), but it's still a different mindset.