They’re not going to retcon the Sequel Trilogy. Like how the previous generation had to come to terms with the prequels being forever a part of Star Wars, the current generation will have to come to terms with the sequels. There’s hope for them to be slowly improved and augmented with ancillary material - what you could consider a slow retconning, maybe - as the prequels were, and of course this very forum works tirelessly producing fanedits to highlight their strengths while trimming the flaws, so it’s not all doom and gloom. In fact, we already have a comic clarifying that Kylo sort of blew up the Temple by accident, and certainly made no particular effort to thoroughly exterminate his fellow students.

Speaking of ancillary material that helped redeem a once-much-hated trilogy of films: TCW was, from the beginning, doomed to end with Anakin (one of the main heroes of the show, no less) killing everyone. In fact, we knew the fate of essentially every character besides Ahsoka - the films had already depicted the deaths of Obi-Wan, Anakin/Vader, Padme, Yoda, Mace Windu, Palpatine (well…), the entire Jedi Order… And yet still Clone Wars managed to be one of the best pieces of Star Wars content and is widely loved. Telling compelling stories in the gaps is a time-honoured Star Wars tradition.