Not any time in the next 50 years.
I'd say that statement is only about 50-50 to be true.
The estimated rates of growth from the Census since 2010 are 1.0%/year for CA and 1.7%/year for TX. These are compounded rates of growth so the effect is magnified the farther out one goes in the future.
So, if I assume they stay constant going forward then TX will pass CA in 2068. That's 53 years from now and I expect that some of our current posters will live to see that date. There's a lot of demographic and external factors that can impact those growth rates, so I wouldn't put too much credence in them, and shifts can go either way. The projections are so sensitive that if TX grows at 1.8%/year instead of 1.7%/year then it passes CA 10 years sooner in 2058.
Poll
