The entire point of the season 1 finale is that if Pike’s fate gets retconned it’ll turn out very, very poorly. If Pike doesn’t end up the way he did in TOS, it means he doesn’t vacate the captain’s chair on the Enterprise, and when the events of Balance of Terror happens, Pike’s inclination towards compromise and peaceful negotiations leads the Romulan empire to conclude that the Federation is weak and declare war, causing the death of millions. Future!Pike even says at the end “every timeline where you don’t end up in that accident ends up with something horrible happening, and someone else taking your place.”