I'm thinking of leaving my current d&d group for another one if they can't agree to be more consistent with scheduling
Why would you leave your DnD group?
I hate to wait for weeks repeatedly.
That sounds frustrating. Maybe you can use a scheduling tool to help everyone get on the same page. It might be hard for them to replace you in the group.
I don't care if they can't replace me, they are not very active anyways. They can just disband the group.
If you have a problem with the group than you should talk it out at the next meeting. Maybe others feel the same way.