I think it's mostly because all the mini classes being raced these days are 4t... It would be kool to see 2t 65s getting raced, just got to wait for the sport to grow before we start adding more classes.
Saying that, I would say they would be a sweet little mini to ride around on, have a bit of fun. But personally I would go a 85 small wheel if you want something like a 65 feel.. Just a little bigger and bit more power.