Pelosi knew the House rules and made new ones up as she went along.
She defied tradition and kept most of her troops in-line.
Could Pres. Trump do that coming in cold ?
I tend to think not. As far as reversing the rules that Nancy changed, someone else can do that. It’s below Trump’s pay grade to become Speaker unless he can have a significant impact. If the GOP majority in the House remains as slim as it appears it’s going to be, and the Senate approx. 50-50, we’re headed for 2 years of grid-lock.