I understand your concerns and they certainly make sense.
We were there in April, and while the trip was different, it was still very enjoyable.
We have another trip planned for October and have similar concerns. Luckily, we still have plenty of time to decide and by then many things will have changed.
By the time your trip comes around, I would expect most everything, if not everything will be open again. So far, by October 1, it looks like there is very little that will not have opened yet, and I'm sure there are still more announcements to come.
However, none of that makes up for the concern of your younger kids not being vaccinated yet, and most likely will not be by the time of your trip.