There's been a lot of threads before if you search you'll find some cool ideas. One is to donate your old robot to a rookie team for them to use parts and learn how things work. Personally I like to keep them and we have our 05,07,08 bots in the shop in semi-running condition. The 05 bot is fully functional for the most part, 07 needs some fuses and relays but will still run and 08 needs the drivetrain reassembled because it was being experimented on by graduating senior.
Also old bots are excellent for driver training. As long as the game doesn't change substantially next year (steps, gaps, or water
) we'll most likely use our Kit based six wheel drive. So our future drivers they'll have something to train on early on assuming we stay 6WD.