A video games business fallacy that outside observers often buy into is that games get canceled for one another. For instance, "Scalebound got canned so Crackdown 3 could get made." That's not how it works.
However, within single studios, some games absolutely get prioritized over others. That's what's happening with any possible Titanfall sequels right now. Respawn has found such rousing success with Apex Legends, it has to put Titanfall on the backburner.
EA and Respawn have released a lengthy statement about the future of Apex Legends, and the developer notes that there are two distinct teams within the studio that each have their own projects. The Star Wars Jedi: Fallen Order team only works on Star Wars, and Respawn won't move resources from one game to another.
However, that only applies to what's already in development. In order to properly pay attention to Apex Legends, it has to sacrifice something. That something is Titanfall. Respawn says "In order to fully support Apex Legends, we are pushing out plans for future Titanfall games." Strike while the iron's hot and all that.
As for the future of Apex Legends, all the minutiae is laid out in the post -- early match server performance, audio issues, cheating, communication, and a regular update cadence. The more exciting news is that EA will give the first details about Season 2 at EA Play in June. We can expect a new Legend, a new weapon, another Battle Pass but "with more meaningful content," and some sort of transformation to the Kings Canyon map.