Unlikely as there is an ice age built-in to eth1 which will steadily increase the time between blocks until none are produced. There should also be a hard fork

Unlikely as there is an ice age built-in to eth1 which will steadily increase the time between blocks until none are produced. There should also be a hard fork which includes code which just stops the old chain on block x. Anyone that wanted to continue with the old chain would need an additional hard fork.