Maybe, but Gretzky was also getting older, with a bad back and an arthritic shoulder. I don't really see changes in goaltending being as much a factor in Gretzky's goal scoring decline than aging and injuries. I don't think changes in goaltending for some reason would have affected Gretzky at one rate, and every other player in the league at a lesser degree. It seems far more likely that it was age and his injuries, all of which are well known to us, that was the result of his decline. Gretzky was accurate, intelligent, patient, and had incredible anticipation. Am I supposed to believe those qualities don't matter in today's league? He never really relied on power anyways. I feel like, if anything, his skills would translate incredibly well into today's league.
Yes he was, but his goal scoring halved in his 20s already. Many other scorers of the same generation like Kurri or Hawerchuk or Goulet declined rather quickly too, it wasn't just Gretzky. With great anticipation you can still score 30 or so in today's league, sure. But if you look at the players competing for scoring titles nowadays, their skillsets are as much about what Gretzky didn't have. He wouldn't be the ultimate player today at least as a goal scorer.