The expiring incentive is far more likely to hurt legacy auto makers. The incentive worked perfectly for Tesla. The incentive was intended to give PHEV and BEV an advantage in the marketplace until the cost of production comes down to a point where they can compete with ICE. The Model 3 hit production stride and started eating the lunch of a lot of established ICE right at the time the incentive hit 200K and started sun setting for Tesla.
Tesla will be able to sell cars just fine after the incentive goes away. Their costs will be even lower when the incentive completely runs out and they might lower their prices by then (or add a lot more features at the same price, which is more their normal pattern). GM is facing the worst problem as they burned up their incentive runway on PHEVs and BEVs only built in low volume and cannot be built at a profit on their own when the incentive runs out. Other automakers will be in that position in a couple of years.
Tesla will be able to sell cars just fine after the incentive goes away. Their costs will be even lower when the incentive completely runs out and they might lower their prices by then (or add a lot more features at the same price, which is more their normal pattern). GM is facing the worst problem as they burned up their incentive runway on PHEVs and BEVs only built in low volume and cannot be built at a profit on their own when the incentive runs out. Other automakers will be in that position in a couple of years.