It seems like the white bass population has gone down quite a bit in the last couple years, granted I haven't fished it much this year. Three years ago there were giant sandies everywhere.
Lake Tyler doesn't have any year round rivers or streams feeding it(that I am aware of) like most of the big lakes in the area, so they tend to have issues spawning. It is also possible that a lot of them went over the spillway as well, with the lake being up so high both this year and last year.
But there are certainly fish there, I see them schooling from time to time, both on the sonar and breaking the surface, and have caught a few heavy sandies over the past few years. I don't target them out there though, so what I do catch are mostly incidentals.