A competitive S/C or S/G car will set you back $60,000. True, you can buy a used small block dragster for about $14K and run the number but don't count on being able to have tune-up to spare and the power for consistency. Costs aren't an issue. I've spent less on a 7.20 Top Dragster than I ever spent on a "bells and whistles" 8.90 car. Oh...just for the record. Most of those 170+ 8.90 cars can run much quicker than 7.70...try 7.10-7.30. That'll qualify them at most T/D events.
NHRA would end up with a similar field quality that IHRA enjoys at it's national events. Perhaps quicker in some regions of the country, slower in others. Bumps for a 48 car field range from the 7.70 minimum to 6.80's at races in Division 3. One thing you have to keep in mind is that IHRA has NO pre-entry policy for sportsman racers. NHRA does and will continue to. That will play a role in the size and quickness of the fields. If you notice, NHRA keeps the size of the .90 classes under control at their events. We used to have over 100-120 cars in S/C and S/G EACH a decade ago but with the pit space for sportsman cars dwindling and the events being run on a tighter schedule most of those classes are limited not not much more than 64 cars. Same number of cars, same entry fee, same space requirements, but fewer headaches and a better show. Not a difficult decision in my opinion.
Another thing to consider is tech man hours. Takes a lot less time to tech an all-out race car than one with throttle stops and who-knows-what on it. Check them over for the mandated safety equipment, adherance to the class rules, and driver credentials and slap the sticker on them. No tracing throttle stop or shifter or tachometer wiring.
I think we'll see it come to fruition in the next 2-3 years. Give all the divisions time to standardize the classes at the LODRS events, build a strong racer base, and iron out any issues they see. Once the divisions are happy with it we'll see one or both of the classes start to penetrate national events. I can't wait!