Long term post-release support is rare and you should be glad you get it when you do. Free content, whether patches, maps, or whatever, incurs a huge development cost that publishers aren't generally willing to offset - did you see Activision doing anything more than maybe 1 patch to games before they could make a killing on map packs on XBL? Raven's obligation to Q4 ended at the first patch so Activision wouldn't have to pay for it anymore, id's games have had longer support because they can afford to self-fund. Gearbox had to release the Halo Custom Edition that included all sorts of crazy fixes plus the ability to make user-made maps as an unofficial add-on. It's just not feasible for studios to do long-term large-scale stuff for free - as much as I'd suspect many of its employees would want to if they could.
Again, based on the wording, it sounds like more in the form of a sequel or expansion may be on the way. That's a good reason to move on. No need to brand Crytek the devil here.