I agree with your 2 month trial. Especially if your kids are willing to try other activities.
Our 2nd oldest (we have 4) has done competitive cheer since age 4. It has been a huge sacrifice for our entire family, however it is her thing and her whole life- and totally worth it. BUT, if she was not 100% sold on it, we would be done. Try other things- you can always, always go back!