If you don't change the classes over time they will slowly die off. Look at NASCAR and how they have progressed.
I do think the changes need to be made slow but I would love to have a water cooled engine. It may cost more upfront but would decrease the cost over time.
The quick change would be fun but man that would cost a lot for both the rearend and for all those damned gears.....
Yes, things need to evolve, but switching to a liquid cooled engine would be a $6000+ change, a lot more than a quickchange.
I'm still for leaving it as it is, update when necessary, and lets go racing.
Side note: NASCAR has changed...and now you can walk up to the window on raceday and buy a ticket, any track, anywhere.
Now make this damn snow stop and lets go racing'....well, I need to put my car together first...