At this point the only way I can see it reach that price is by solving blockchain trilemma. Ethereum 2.0 phase zero will be launching on January 2020 but we don't know what to expect in the next couple of years. If the overall transition will be successful within 2 to 3 years reaching $2500 would be easy.
I know this is a mega thread and there a lot of conversation regarding it, but it just want to ask one thing to you, suppose they launch the next phase and it will carry on to the next blockchain and the current blockchain will be left alone, how do you view that as an investor point of view if you do not have a plan and keep on changing with every update, so what do you expect, people will invest billions after the launch so that the developers will make more money, it is not going to happen and the expectation will kill ETH.