As long as there's a way for that to happen without the need of massive grinding to beat him, I'm guessing that more people would celebrate than complain.For the simple fact of him being Red, they can make all his Pokemon level 90+ and most people wouldn't complain.
I want Red to be the strongest trainer of them all because he is just awesome. :P
Really, though, they should make him stronger, while making everyone else in the game stronger with him, so you don't have such a bad advantage. He was quite easy to beat because most of his Pokemon were a single type or had clear weaknesses. The only problem was that you could never train to his level just like that because of the lack of matching level wild Pokemon to train with. (i.e. level 50-70 wild Pokemon to train with.)
wait, I just realized something. since there was never a yellow remake, Red shouldn't even have that Pikachu in the remake's canon.
But me, and probably some other people, still might believe that red is actually from the anime. Which did revolve around the video games but also had it's own story, and red had his pikachu all the way up to the emerald series, and he's yet to appear in the d/p/pt series.
He's more likely to be based off of the manga than the anime, but I think he's just his own character. He'll never be stronger than Pearl now anyways; he's got a Pikachu, which still has terrible stats at Lv100 (even with the light ball)