In most cases, yes, but I don't think it implies stagnation. With the exception of the CSS ones which have been obsoleted by modern flexbox, those questions are mostly basic enough to defy change:
php: check if an array has duplicates
Java: what's the big-O time of declaring an array of size n?
I agree, plateauing may be more apt in this case. I wonder to what extent exemplary questions like these remain universal, or have an expiry date that just isn't known at this time.
php: check if an array has duplicates
Java: what's the big-O time of declaring an array of size n?
SQL: what exactly do Primary Keys and Indexes do?