I'm most concerned with the juvenile infection rate, most Adults have vaccines available if they choose to become protected.
They're not independent, but very related. If the infection rate in general is higher because of unvaccinated adults, the juvenile rate will also be higher because of their exposure to adults. Likewise, if the general risk is very low because enough adults are vaccinated, then the risk to juvenile is low for all of those adults interactions. The juvenile rate on it's own may have a larger impact in schools, sports, or other activities where the exposure is primarily other kids.
I know a family with young kids who are not eligible to be vaccinated yet. They had a trip planned two weeks from now. They were comfortable wtih the guidelines as they were in place when they booked the trip, booked the plane tickets, made reservations, etc. Now, they are quite upset and not sure what to do. They don't feel comfortable with the risks for their kids.
This is why we moved our trip to next year (again), also because we could move it. We made the decision long before the conditions on our trip date will be known. It could be completely fine by then, but by moving it earlier, we're not losing any money. We were also able to plan an alternative trip with more options that can be adjusted based on conditions at the time and less money committed to activities we may decide not to do if conditions worsen.
Right now, with FL at 11/100K and 0.26/100K we wouldn't want to put an unvaccinated kid, even in a mask, in indoor scenarios with unvaccinated unmasked others for long durations. That's before we even talk about restaurants with increased capacity.
By our trip date, FL could easily be at 3/100K and 0.05/100K, a metric we would feel much better with. Or, FL residents could be saying "hold my beer" and plateauing at a number above that and below today.
What seems to be clear is that people planning summer trips should assume there will be increased capacity, reduced distance, and elimination of masks and other mitigations while still largely at the same community metrics as today. If someone isn't good with that, committing money on the hope it's lower is a gamble. Might win, might not. If someone is fine with that, and they end up better (likely at least some better), then it's a bonus win.
Just like if someone only wants to commit the spend for a WDW trip if there will be fireworks, shows, and other currently missing items. Might happen, might not. The gamble depends on how disappointed they'll be if it doesn't happen.