That would not be his call to make. That would be CBS/Paramount’s. Matalas is just the guy they hired to run their show. So far, despite the contradictions all five streaming Trek shows have with each other and the previous Trek shows, CBS’s stance is that they all take place in the same universe, and I don’t see that changing, because quite frankly CBS doesn’t care all that much about ‘continuity’. I myself do not subscribe to this, but my opinion isn’t relevant to this discussion.
No, it’s not inevitable. If CBS doesn’t want to produce expensive new Trek streaming shows, they won’t, despite what Matalas would like to do.