I don't know that it really matters what the NFL or fans would prefer. Most colleges are using running/mobile QBs more & more so every year the pool of the pure pocket passer shrinks. Just going by the numbers alone means that every year there will be fewer of them to choose from.I love mobile QB'S as long as they can do both. How many QB'S with elite running skills have won Super Bowls? Steve Young? I don't remember.
Plus all the rule changes really favor the running QB. 15 to 20 years ago someone like Lamar Jackson would have probably been dead or crippled after one or two seasons. Look at Randall Cunningham and how many games he missed because of injuries.