i would wait until the game is actually out and you can see more of what the game is like before deciding. a lot of things have changed since gen 5, even if megas and z moves aren't coming back we still have a new type, lots of new pokemon, new moves, and new items.
i probably won't be getting ss because it doesn't seem that impressive from what we've gotten to see. i know it will at least be good because pretty much all pokemon games are at least good, but if i'm paying $60 for it, i want it to be better than good. unless something major changes, they delay the game (and with the anime for sun and moon drawing to a close, i know it won't be), or something happens to make the lack of features i want okay, i'll probably just spend $40 getting the gen 6 games since i went from white to ultrasun and never played xy and oras