Second, most competitors are years away. Tesla is producing and shipping their mid priced car already, while most others are merely announcing, planning and developing theirs. If you want a 200 mile range, Nissan Leaf is already a decent competitor, though.
Most of us would like longer ranges (300 miles or more), and there is literally no other company than Tesla with EVs of that range. The EVs from VW, BMW, Daimler etc. are not on the market until maybe 2020, and with shorter range. Their second attempt will be ready 2-3 years after given the usual production cycle. By mid 2020, Tesla likely has substantially longer range than 300 miles and lower prices than $54,000, and they may very well be close to producing 1,000,000 EVs yearly (they just need to double current production rate once per year to achieve that).
By 2022-2023, when the competitors are finally ready with cars that can compete with the 2018 Tesla model 3, I bet Tesla is already down in the upper end of the low priced segment or the lower end of the mid priced segment and that they produce several millions of EVs yearly.
Like you, I would love for the others to catch up. Competition is good. But I increasingly doubt it will happen.
Tesla can literally just copy their current production lines a number of times at different places in the world, wait for the battery efficiency to improve as it has done every year, wait for battery price to drop, as it has done every year, while expanding their charging networks. Not that I think they won't keep innovating. It's just that they are so far ahead already.