No you're right, while I don't think he's dumb I will have to qualify that statement as the dumb statement of the day, there are more v6 rental car chargers and police chargers that inflate the sales numbers than v6 challengers that go into fleet. It's roughly 80k per year sales for chargers versus 65k for challengers.
Flagship models always attract people in sales, hellcats attract potential dodge customers in and they flock towards sxt's,gt's, r/t's, and scat packs, which is why fca started putting out those performance "packs" like higher trims hood's, rims, spoiler, etc etc. This concept is what attracts buyers, i.e the S class and 7 series attract buyers of bmw and mercedes even if those buyers end up going with a c class or 3 series. So while I don't think they will cut these models out they are definitely milking them and will probably cut production accordingly, when the new generation comes out I'm sure there will be drastic changes due to epa requirements, safety standards, etc etc
Something like shaving off 500 lbs plus twin turbo smaller sized v8, awd, all the new tech features would be very attractive in a new charger, I still think challenger will be tough to update as people like the retro look but make no mistake all those changes listed bump up the sales price by 10-15k and so now the counterpoint will be "is it worth spending 90-100k on a dodge," It will be interesting to see what exactly fca does.