There will not be a Linus 2, but rather there will be a peaceful transfer of "power".
Linus is not the Benevolent Dictator For Life of the Linux Kernel.
Linus has already stepped away from developing the Kernel. He did this after an incident to work on his professionalism & mannerisms towards people. Kernel development did not stop. Linus does not approve and merge every patch into the Kernel.
Rather it is more likely that the Lead Maintainer/Developer changes to Greg Kroah-Hartmon, and the project does not skip a beat.
Rest assured with something as important as the Linux Kernel: development will keep going.