Current F1 cars aerodynamic influence is so strong that without DRS there would be zero chance for overtaking of the cars of similar pace. So most of the race results would highly correlate to qualy ones, no need to spend time watching.
"Too easy overtaking" is not an argument because following the same logic the car been overtaken could easily return the position back using DRS in the next lap or even next straight.
So if we want remove DRS, we need to prohibit wings and return to 60s to BT20.
One solution would be to prohibit all aero devices except the front and the rear wings.