Its main characters have long since been chewed up and excreted as "brands" that lack soul and creativity. So it's silly to bother with popularity contests about them. Superman and Batman aren't going anywhere.
What is remarkable is how the topicality of the original golden age and silver age characters has become fossilised.
Hal Jordan as a test pilot in the space age was brilliant. Hal Jordan as... what exactly? In the 21st century is stupid.
But not as stupid as millionaire (now promoted to billionaire- inflationary spiral much?) playboys, journalists and even cops as alter ego professions.
The Brave and the Bold cartoon played around with the existing universe brilliantly, acknowledging apparent contradictions and blending it into a wholesome and relatively harmonious whole. Smallville simply started again, and I think to the extent it failed it wasn't the cornball and soap opera- that's what fans liked- it was shoehorning existing DC comics elements into it without fully Smallvillising them.
At some point the trademarks will reduce in value to the point that they melt like ice cubes... Not yet, and not particularly soon either... But it is as inevitable as entropy itself. We will see genuinely new characters again, but it will take the next Stan Lee to do it.
And he or she is not working for Warner or Disney, by definition.