As everyone knows, the DC Universe doe t really age. While to be fair, it technically does, it doesn't progress quick enough at rate for it to truly matter. This is why Batman hasn't died of old age, Why Wonder Woman still looks like a supermodel, and why the first generation of sidekicks, the Titans in short, are still in their twenties.
This is also the in-universe excuse for why characters introduced 80 to 60 years ago are still the leading characters in the DCU, and these Silver Age - Goden Age heroes haven't passed down their monikers to their sidekicks. However I have a question: Do you think that there ever will be a time when the Titans generation of Dick Grayson, Donna Troy, Wally West, Roy Harper, Aqualad, etcetera, will be the most prominent characters at DC? This might seem unlikely, but I think there is a veritable possibility that a scenario like this will occur.
Status quos fluctuate and shift. Especially the public's interest in a brand or franchise. X Men used to be far and away the most popular comic based property from the big two. I explicitly remember instances in the 90s when the top ten best selling were completely filled up by X-books. Are the X Men as much of a phenomenon in the popular culture as they were in the 80s and 90s? Of course not. Marvel decided to shift their focus on the Avengers, and not just the comic reading populace, but the public at large as well have come know the Avengers as Marvel's premier superhero team instead of the X Men. Frankly B-list characters such as Iron Man, Black Panther, and Thanos are now arguably considered more iconic by "normies" (excuse the term) than even Superman himself at this point of time. I can't see why the Titans wouldn't achieve the same success one day.