The next closest non-Chinese consumer drone costs like 5-10x as much as DJI and still isn't as reliable (think like $10k). All the U.S. consumer drone makers checked out of the consumer market and went after military contracts only (and still aren't very reliable lol) due to their basically unlimited budget.
If lawmakers think it will give the U.S. an edge by just banning the competition, they can think again. It won't spur the kind of innovations they think it will on the consumer front. Stuff like drone delivery and military were always doing their own thing, so it won't effect those markets. All a ban on DJI would do is kill off small businesses and innovators.
The better option would be to invest in the U.S. companies to spur on their desire and ability to compete. Encourage chip manufacturing in the U.S. to be more competitive and accessible to those willing to innovate, so we can have affordable flight controllers, etc. Also, looser regulations for small independent businesses with more strict regulations for larger ones (otherwise major corporations just end up with a nice regulatory moat, insulating them against potential startups and innovations).
There needs to be more competition, not less. Accelerate innovation instead of killing it.