well,
1. Garbon is not paid for what he's doing... or any other modder for that matter
2. there're now 3 different maps with AGCEEP on them, albeit different versions, so you can't really complain. Not to mention A4K or WatKABAoI for greater variety.
3. someone could update MyMap version of AGCEEP to recent release with no problem, but it would take some time... I don't see any volunteers, so why are you whinning about new map not released yet?
4. if you're tired of waiting then do something yourself

like new map
5. if the fanbase extincted before new map arrival who would care?

6. I was tired of waiting long time ago and I actually did something about it (like porting AGCEEP onto Watk map all by myself). Now I have the comfort of not caring if the map is ever released.