I don't have any problem with older carb bikes, I helped get them allowed at AMA. There are quite a few older Shootout-type bikes as well as some Super Street bikes that would fit perfectly in the class as it stands, and more bikes can only be better.
How to integrate them into the class is a different issue. The allowance of all the aftermarket electronics has changed the playing field significantly since AMA allowed them. So what would you do now? Do you allow aftermarket carbs? Do you allow fuel injection conversions? It would be very difficult to get a carburetted nitrous bike to be competitive with a modern FI bike. Not only are the older bikes giving up horsepower, but limited to carbs they would be giving up serious amounts of tuneability and control, and that is more important than power. And a carbed turbo is completely out of the question. So if you don't allow an FI swap, I am not sure what is really going to be accomplished by any of it.
But allowing them to have fuel injection would create problems with the rules as they stand now. The current bikes can't change to different throttle bodies, but any carb-to-FI conversion would be by its very definition a throttle body swap. So that would mean that the factory-carb bikes get to do something that factory-FI bikes can't. If it were up to me, I would allow the FI swap, but I would limit it to production throttle bodies with the same mods currently allowed, and I would limit them to a single injector per cylinder. No way would I give them the chance to take advantage of the 2-injector setup when a Gen I Busa can't do the same.