To be fair neither one of them could act. Hell it's well known that if Denise Crosby hadn't quit; the plan was to dump the character of Deanna Troi (and actress Marina Sirtis) at the conclusion of season 1. It's a story Marina Sirtis has told many times; and it was even confirmed to her by majel Barrett in later years.
Yeah but the reason they wanted to drop Troi is because they found her character "too hard" to write.
I do wonder what they might've done had they lost all three female main characters after S1.
I did a little "what if" thinking around this and devised the following:
- With the death of Lieutenant Yar, Lieutenant (jg) Worf is appointed Chief of Security
- Commander Crusher accepts a post heading up Xenobiology at Starfleet Medical and is replaced by Lieutenant Commander Selar, the former Assistant Chief Medical Officer of the Enterprise-D
- Lieutenant Commander Troi is offered a position with the Federation Diplomatic Corps and accepts
- Starfleet assigns Lieutenant Commander Mizari Vahl (either a Bolian or Zelonite, some blue species) to the Enterprise as Second Officer, as well as a special diplomatic/linguistics/political advisor to Picard and Riker. Data remains at Ops though is demoted from Second to Third Officer
- Lieutenant (jg) La Forge is promoted to Lieutenant and remains as Conn Officer
- Lieutenant Sonya Gomez is appointed as the new permanent Chief Engineer, despite her youth she has already demonstrated herself as one of the best engineers in the fleet
I think that's a bit very optimistic, remember they were still operating under the idea that 3 female characters were, somehow, "too many" and Selar and Sonya Gomez were only conceived during season 2.
Sirtis was kept because they didn't want to lose all 3 femal characters, but I suppose it's still possible that Sirtis could have quit for whatever reason, leading them to lose all three.
I think what would have happened would have been like:
- Worf and Geordi would have still gotten the same promotions.
-We would have still gotten Pulaski for 1 season, with possibly Selar replacing her after that(in a scenario where Gates McFadden doesn't return) or a new CMO that is suspiciously similar to Beverly being introduced in season 3
-Data would have been moved into Troi's chair (not as counselor, but as 2nd officer, we would never have gotten a new counselor)
- They would have hired a new attractive actress as female eye candy to brighten up the bridge (just like Troi was used, only in a standard uniform) possibly taking Data's old seat at OPS or the Helm (with Wesley moving yo OPS) possibly they would have called back some of the runners up for the Hernandez character for this new one.
The new CMO (if not Selar) and the bridge bunny character would either have been humans or a kind of alien that still allows the actresses to look as conventionally actractive as possible, there's a reason after all that Betazoid and Bajorans look so human (and Trill turned more human looking once Farrel was cast)
On the positive side, as the writing improved by season 3 and beyond the bridge bunny character might have grown into a competent and nuanced character, provided they managed to hire a reasonably talented actress.