So at this point it may be less about their (still unprofitable, fifth-ranked) streaming service being “the home of all Star Trek” and more about consolidating the franchise library to present the most attractive package for buyout. The wisdom of cancelling PDG as part of that is debatable however.
Regarding Shaw, Matalas was on the Trek Politics podcast and said that a) Shaw was always meant to die, b) implied he has - and has always had since LEG was a plan he was already formulating - a way to have Todd Stashwick as part of the possible cast. He denied there was ever an oh-shit moment when he realised that Shaw had become a breakout character - who he’d already killed off…
So if P+ goes to the wall and Star Trek finds a new home, doubtless all sorts of proposals will be made. It’s possible that Matalas could get lost in all that, although obviously having a pitch that is heavily tied to one (or more?) of the more higher-profile and successful and popular strands of the franchise probably won’t hurt. Maybe it’ll never happen and Legacy will be just another could-have-been along with Noah Hawley’s idea and whatever Bryan Fuller’s original plan for DSC was…
Strange New Worlds wasn’t formally announced until a year after DSC s2 (which introduced this Pike, Spock & Number One) ended, so don’t despair or rejoice yet (depending on how you feel about Legacy), it may not happen, the decision may be taken away from the lunatics currently running the asylum!