Loss of the tax credit will slightly shift the EV transition out in time, but not completely prevent it since the rest of the world has more or less kept its sanity and is promoting EVs.
Ultimately though, Tesla ends up "winning" because they would have been the first (by far) to phase out their credit and would have been competing against automakers that could effectively price their vehicles $7500 higher. So Tesla lost about a year of credits, but all other manufacturers (except GM) lost several years.