I think it is worth it. I just bought a 3DS 2 days ago in anticipation of Pokemon X/Y. The last Pokemon game I bought was Diamond like 6 years ago now. Black and White was way to underwhelming for me to get back into Pokemon, but X and Y looks like a keeper. I mean with every new trailer it keeps looking better and better.
Also there are plenty 3ds games, both released and upcoming, that are good titles. Either way it wouldn't be a waste.