We could pretty easily convert the max-8 into 150 seat aircraft... 5 rows of real business-class 2x2 seating with free (working) wifi, power outlets that work, and a couple drink coupons would be more attractive that whatever it is we're trying to sell right now. Throw in a free premium snack box and some soft airplane slippers, maybe even a hot damp washcloth before giving them their drink and snack just to make them feel even more special. Add a free checked bag and a guarantee they'd never have to check their carryon. Board before the wheelchairs too.
Instead of whining about wrong-sized planes, we could actually FIX that. Pull out some cheap seats, add a few less really nice seats. Hmmm sounds risky to copy what pretty much every other airline including spirit does to make more money...