There are half a dozen possibilities, all of a later generation than Corbyn.
I worry that he could cost us Remain because X% of Remainers would prefer Brexit with the Tories to Remain with him.
I'm worried that there'll be a GE and the tories will win again thus securing May's deal! That's what I can actually see happening now if Corbyn keeps pushing for it. He's not interested in brexit he just wants to be PM!