I can relate completely. My tastes have become a lot more niche, and lately I find that the 3DS is the only system that really has any offerings that appeal to me. I still play a few newer franchises like Demon's/Dark Souls and I'm looking forward to The Evil Within, but beyond that, I just play Atlus RPGs (which still play like the best the PlayStation had to offer) and emulators.

I'd suggest checking out the ROM hacking scene, especially if you like platfomers. There are hundreds of Mario hacks, many of which are essentially brand new games running on the original game engine and with the original mechanics. Super Metroid is in the same boat. Then there's Zelda Classic, which is a PC port of the original Zelda on a new engine with a level editor built in. There's tons of quests made for that as well. There are so many older games getting fan translations that never made it out over here to play as well.

If modern gaming isn't for you, there's still an endless amount to discover concerning older games, and even new "old" games coming out all the time if you count ROM hacks.