There is no viable competitor to DJI for consumers when it comes to the software side especially -- DJI software is miles ahead of the other drone producers (on-drone and their mobile apps).
Once these were overcome they have bounced back and are looking stronger than ever, their revenue has now risen above the pre-sanctions peak.
The year after? Poof, very small percentage of the global market.
Need a phone with a great camera? Then Huawei is much better than anything Samsung, Apple, and Google makes. Huawei market share was taking off at crazy speed before the bans on both the software and hardware side.
I guess that depends on what the goal is? If a foreign company is the market leader, banning it allows US companies to take over the domestic market without having to actually figure out how to be competitive with the market leader.
There are no US companies capable of serving this market. None can produce the product DJI did and consumers will abandon the market before they'll transition to a product that costs twice as much for half the value.
This is not like smartphones or laptops or televisions or any of that, it's not needed, it's a total luxury and hobby for 95% of buyers. They will walk before adopting a shitty US-based alternative and the market will shrivel and die.
So, this is a fine policy if hurting US consumers by destroying an entire field of hobby to thumb our noses at China is the goal. It's a broken policy of stimulating a US alternative is the goal. To accomplish the latter, subsidies and reasonable tariffs are the right approach, not bans.
This assumes end users will accept an inferior product. Without some additional pressure - subsidies or hell even nationalism - a ban alone won’t magically create on par US companies.
China has been doing this for decades so we don’t need to guess here. They seem to always bring much broader societal, financial and other support not just restrict access