Cod Ghosts just came out, that and all R* could offer so far was a little wimpy 500k boost that most people call chump change. But all in all I believe R* wanted to wait until the big releases came out (Ghosts, PS4, XBone) before rolling out there DLC content.
In all fairness I can understand why R* would wait on things to come regardless of it being almost 2 months since release and the promised free packs that were going to keep coming but didn't, but I never liked COD so GTA is a must have for me. I am still playing it and its really only based on your mindset if you find it fun or not.
When the free stuff comes ALL OF YOU will be playing it, period. Things to look forward to while on your hiatus; Heists, beach bum pack, content creator, more DLC. Till then play what you want, its better to be a gamer than a developer right now