To be honest people shouldn't have expected Isaac in smash because of the trademark. You don't trademark a character or it's franchise to get into smash, no one has had that, and isaac clearly didn't get that back when he appeared in Brawl either. People only had themselves to blame for expecting him due to the trademark, at best a copyright would've been more of a lead, and even then not really…. Specially since this new trademark was filed by NoJ and is class 9 and includes a bunch of stuff the other current GS ones don't have, AND the trademarks for the original games and DD didn't need anything back then and we can see that by how DD is JUST renewing its trademark now in its last year of lifetime, and GS1 still has till 2021. Honestly we were just looking it from the wrong perspective because we were so focused on Isaac for smash and not knowing how trademarks work and are really for.
At some point this year we can easily get that game announcement, whatever it is (new or remaster or remake or whatever). Even if mario golf happened that doesn't really take away GS chances away, specially after all the time it has been since they last put out a game I could see both. Tbh if it was mario golf it shouldn't have taken this long for them to get it out there already, so I "personally" doubt it's mario golf already, not to mention that didn't get a new trademark of any sort, unlike GS.