Tesla has been around for a while and GM actually has a car that directly competes with Tesla Model 3, and many are coming. Sure Model 3 will be marquee model, but it did not have surprise element of iPhone nor people buy Cars every two years. Even to this day, building EVs with big batteries is not economical or profitable, that may change now, but building EV is not a rocket science. Every major Auto manufacturer has the know-how, they may be constrained by the supply-chain in the future. With low gas prices, people want SUVs not Sedans, if Model 3 was economic SUV, Tesla would have voraciously eaten couple of Car companies, its a Car and so the rest of the ICE world, will survive them!