Who ever mines BU will lose all the money they spent on mining it. So that 50% threshold means nothing. Any fork of Bitcoin will be attacked ruthlessly by those who have enough resources to destroy any miners foolish enough to try.
The large miners/pools know this. The April's fool joke is on anyone who believes that signaling means anything on Bitcoin. It doesn't.
I've awoken from my inactivity period to take my part in this pursuit.
Although economically we all understand BU has and never shall have any standing, a fork is incumbent and it's outcome is still obscure.
Core hasn't been keeping the system updated, and their refusal of further updates and generally increasing the Block size is alarming and drives support away. The bitcoin unlimited bound failure doesn't lift any responsibility away from the core devs...
That said, I am here to pledge my computing power and spare time onto the complete disruption of the forked blockchain, transaction, nodes and miners. I will play my role, when the day comes I expect others to join me.