Any "Bitcoin 2" will only have to be a response to an exploit and a hard fork upgrade of the existing network in which the old chain would necessarily become unused because it is exploitable. Anything short of a near complete switch of 95% of miners and clients, like a SHA2 to SHA3 upgrade when and if SHA2 ever gets cracked (big IF) will result in a precarious balance that will cost millions their life savings.
The only way I think a hard fork would ever work is compound soft forks that combine into a hard fork only when the overwhelming majority have switched.…
Why is this concept so difficult for people to grasp? I can't seem to express it properly, or the listener is just willfully ignorant to protect their bags.