Bitcoin will separate? That sounds vague. Bitcoin will not split and there will no BU and BTC co-existence after the UASF. And as in addition, no separation will occur since this just a User Activated Soft Fork and not a Hard Fork (correct me if I am wrong here).

Bitcoin will not end upon the activation of segwit/UASF. The activation was proposed (and approved?) in order to upgrade Bitcoin so how come that this will trigger the end for Bitcoin?