These "other manufacturers" are the same knuckleheads that have been screwing over customers with poor sales, service and quality issues for decades, so anticipating they are going to somehow magically transform both their business practices AND produce a competitive product at scale, and pack Tesla's lunch is a fairly myopic and unlikely outcome IMO.
Edit - that's not to say I believe "big auto" is dead, far from it, but their ability to outmaneuver Tesla in the full battery EV market, for the segments Tesla are going after, is going to be handicapped by a lot of factors including the "inventors dilemma" , wanting to protect billions in existing investment/infra, and more. If anything, Tesla is well positioned to start moving "down market" with lower priced models at some point.