It will split the internet, not so sure about hardware because there's less propaganda value in that.
In many ways the internet split is already done, there's hardly any overlap between the Chinese and US web. Probably because most of the non-chinese web is blocked in China.
Theoretically, this makes Chinese web companies less competitive. Many US companies are dominant worldwide, but the majority of popular Chinese tech companies are only popular in their captive market.
IMO it's similar to the captive markets of the Soviet Bloc. Strong protectionism and state sponsoring like China has done, and the Soviet Union did historically created companies that weren't globally competitive. The day the iron curtain fell, treasured trabants were abandoned on the side of the road.
Will history repeats itself? Who knows, but the situation is very similar. China produces a lot of good products, probably moreso than the USSR at it's peak. But China also engages in many practices that eventually made Soviet products inferior.