There certainly would be issues having all '20 and '21 age-outs marching in '22 with having a mass exodus of membership aging out in a single year. Extending the age out to 23 permanently would be one way to fix this, if that's the route they chose to go. Selfishly, if there's no season I'd like the offer to be extended to at least the contracted rook-outs, as I feel there's a significant difference between missing your last year and not being able to march at all. But it is what it is.
I do find a great deal of irony, though, in the "get a life" sentiment towards people who'd march at 23 from people who have posted thousands of times to a forum about a "kids activity." Same people who would probably have marched well past that if there was no traditional age limit.