In our area, the time commitment and cost are putting people off. I know of several moms who have kids in tumbling classes who are interested in full year cheer but think it's too much. I think maybe gyms could experiment with later tryouts, lower costs, less travel comps... at least for younger age, lower level teams. They could end up attracting more business.
During the summer they would still offer camps, classes, clinics, etc.
Also, I think teams would not necessarily be less successful with kids having been on a couple of months break from mandatory practices, but that's of course debatable.