I'm not sure if there was a backlash enough to cause DC to wipe out the Diana/Steve romance, but there were other reasons. I suspect they wanted to give Wonder Woman independence and not have her allied with a man at all, which they've pretty much continued except for some ill-fated romances scattered throughout the past 23 years.
A pity they can't try again (like the Mists of Nepenthe couldn't work! ;) ) with Steve. Give him that sensitivity that appreciates Diana's power and also emphasize his heroism and occupation as Marston did in the Golden Age. There could be good stories of the two of them trying to adjust to each other and their particular issues, but I think it could be fun. I think Diana could use a partner who is portrayed as mature and self-confident and lose the frat boy elements *cough* Nemesis *cough* :)