Re: What if Tasha had survived?
The further down the road you go, almost the more interesting it gets. If Yar's still around, what happens to her in "Generations" and beyond? Does she become Picard's XO in "Nemesis"?
Instead, if Troi's out of the way, and Marina Sirtis is playing Yar, I bet Riker and Yar get together.
"If you can't take a little bloody nose, maybe you ought to go back home and crawl under your bed. It's not safe out here. It's wondrous, with treasures to satiate desires both subtle and gross; but it's not for the timid." - Q