Wait, is there actually credibility to the idea of a path to the DL Forward plot from Disneyland proper? Yeesh.
Part of Disneyland's appeal is the berm, and the framework created by Walt in the '50s. Sure, we've gotten some new lands- New Orleans Square, Bear/Critter Country, and Mickey's Toontown- but these served as thematic extensions of Frontierland and Fantasyland. I'm leaving out Galaxy's Edge as I still believe it has no place in Disneyland, and there's a reason Disney worked so hard to 'separate' it from the rest of the park. Let the place rest and focus on running what's there as well as possible- fix up the service, the attractions, and the food quality and start to rebuild the 'legendary service' reputation the place used to have.
There is also the question of- how big should the park get? Would it be able to have a large enough increase in daily guests to justify the increased operating costs? If this DL Forward plot became a third gate, they could shorten the park hours etc. if attendance is low like they do for DCA. Plus, sell more day tickets and make Disneyland Resort more of a week long destination.