If BIP148 activates
Then UAHF will be alive on the same day. The UAHF chain will protect the economic transactions that are under risk of reorganization because of UASF.
Later, we will support the activation of SegWit on the UAHF chain if there is no patent risk associated with SegWit and if the arbitrary discount rate of witness data segment is removed. The weight parameter, which is designed for artificial rates, may need to be deleted and we need to be frank and straightforward in the software code about different limitations on different kind of blocks and other parameters. A SegWit without the artificial discount rate will treat legacy transaction type fairly and it will not give SegWit transactions an unfair advantage.