Do I believe it? No. As a natural-born redhead myself, I’d be more interested in knowing if the gene responsible for redheadedness is “dying out.”
The funny thing about recessive genes is that they lurk, and then spring out unexpectedly, pouncing on their helpless prey and making them the butt of jokes. So even though for centuries, non-redheads tried to kill us off or burn us as witches, we keep coming back.
Like a bright, shiny copper penny. Not bad at all. 😉
So no, I don’t believe blondes are in danger of “dying out.”
The writer of the WhizKidTech website rightly notes that we redheads are wildly ambivalent about our hair coloration: we hate it as kids and love it (mostly) as adults. There is no middle ground. It’s a redhead thing.