Short answer: the network has reached capacity and must be increased in one form or another.
I think it won't happen. Immutability and consensus can only be reached over status quo.
As I said elsewhere, the valuable commodity will not be the coins any more, but the room on the chain.
All that the BTU coin folks require is 51%. After all, they are entirely convinced that having 51% hash rate equals to being Bitcoin, which is on a level of absurdity not seen in a long time. Do you think that it is not possible for them to reach this number?