I'm not sure what the answer is and I'm not sure the 300s are right for the TT. I'd like to see more variety and I do have a soft spot for smaller bikes but it's a massice gap betweena 300cc street bike to a 1000cc superbike. With the loss of the Supersport 600s there doesn't seem to be any middle ground anymore. I'm sure people will be racing 600s for a long time to come but they'll go the way of the 400cc bikes and just end up being old machines.