I'm not a Wonder Woman expert like a lot of people on this board. But from reading this board for years, Steve was not around in the Wonderverse in any significant way for years until Rebirth. People say he was aged into an old man during the Perez years and not a love interest. People say Nu52 had Wonder Woman/Superman as love interests. So the "80 years" is true, but there was not consistent investment in those 80 years if what people say is true.
I will speak on what I know. Both Wonder Woman films feature Steve, and the pairing was well received. Bloodlines features the Diana/Steve pairing. I liked them, and I liked Steve's individual personality. Rebirth has focused on Steve as an individual character in the main Wonder Woman comic, he got a spinoff Wonder Woman comic, he's apparently in Checkmate, and he and Diana were in a Valentine's Day comic with their own story. It is highly likely he will be in her video game.
DC is already investing in him. Cloonrad seem poised to invest in him more hence the work they are doing to make Diana/Steve's first meeting impactful.
It is through this repeated investment that a personality can continue to be developed. That doesn't mean you have to like the personality or the character, but DC has already made their decision that Steve and Diana/Steve are valuable to them.