It really is good, though, that Paramount was willing to have in the budget as main characters people who were, in the first season, rather undefined roles like Worf and LaForge. You could easily have had an "ensign of the week" in LaForge's role, and pretty much everything Worf did could have gone to Yar. Thankfully, those things didn't happen, and we were able to have them develop into very compelling characters.
When the next show eventually gets into production, this is definitely something I'd like to see done (sorta). See what I'd really like to see is something like how TOS started with just Kirk and Spock (eventually adding McCoy) and then allowing the background characters to grow without forcing them into their positions [sidebar: for all the problems
Enterprise had as a show, the Archer/T'Pol/Trip trifecta was damn near perfect. But characters like Mayweather, and to a lesser degree Hoshi and Phlox, just didn't seem to really click. Reed was awesome though.]
So, cast three mains, like a K/S/M or an A/T/T, but also have some rotating second tier players that aren't tied down to a station that the writers can play with throughout the series.
Back on topic, in our TNG rewatch project, we just watched "We'll Always Have Paris" tonight. It's the first post-Tasha episode and the difference with Worf is astounding (and that's not a slam on Tasha, as I'm a long time Yar fanboy, just a realization that, while having a floating bridge officer like Worf was for most of the season can be a neat idea, once Dorn took that position fulltime he really started to shine).