Am I going to be screwed over come December when people start trading non-X/Y Pokemon?

I stopped playing sometime after Gen 2, only recently got back into it when I tried Black on my R4. Come December when people start breeding/training Pokemon not available in X/Y am I going to be at a disadvantage, since I'll only be able to trade Pokemon from X/Y? I don't have any older gen Pokemon to exchange in return, which I imagine is what people will be looing for...