Recalling the qualifying and race times from the Runoffs, it appears that the natural order of things has already combined the two classes (DSR, CSR) the SCCA just hadn't noticed until recently and this proposal catches them up to reality.
winner DSR 36 Tom Bootz-fatest lap 2:02.656; average of 5 fastest laps 2:02.973; average of all laps except "green flag" lap 2:03.327
winner CSR 84 Steve Forrer- fastest lap 2:02.782; average of 5 fastest laps 2:02.899; average of all laps except "green flag" lap 2:03.286
These similarities in performance are seen throughout the grid. If the rules of the cars are left as they are now and the classes combined there should be minimal angst. The rules will need to be couched as (level 1; level 2) or something like that. The weight for each engine combination left pretty much as it is now. This should be one of the easiest class consolidations ever undertaken.
I guess that the question I have is why do they need to add another class (SR2) to have cars with what appear to be essentially the same rules except for no underbody aero? That is not going to make the class more financially achievable than the DSR/CSR class and it just keeps moving the ball away from the ultimate stated goal of SCCA of "reducing the number of classes". If they decided that SR2 was to have 600cc bike engines that couldn't be tweeked to the max (the 13K rev limit may certainly be a part of that) perhaps it would be a cost saving vs. existing class but with the statement that a DSR could be transistioned to this new class by changing the underbody aero it seems unlikely that this is where they are going to land.
