I feel ya! I get that way with about every system I have at one point or another. In the end I'm glad I keep stuff around though. I always end up going the other way and getting extremely joyful playing what was once boring.
Ah same here, NES I sold half already... and dont miss it. Bought 2 new PC's with the $$. I kept the NES games that arent worth anything or ones I like. I don't feel this way about any other console. Just played Intellivision and 2600, very good time, no change lol.