I think you mean ... the success of 5e compared to any other TTRPG published, ever.
That's the correct comparison.
Sure, it's not as successful as other incredibly successful forms of entertainment. You could add, for example, that D&D has yet to surpass the revenue of the NFL if you wanted. But that's not really the proper comparator, is it? Doing the best of any game in its field, in history, is probably sufficient to call it not just impressive, but an unparalleled success. Not to mention that 5e's peak has far surpassed the very limited boom years of the 80s fad, which only lasted from '80-'83.