Every now and then an old song gets a new life when a famous actual artist performs it (American Pie, I Love Rock'n'Roll, Another Brick In The Wall...).
Which Queen song could become a hit in your opinion? It can be a remake in any style. Many songs from the Queen Dance Traxx album, for example, were radio hits around Europe. Sarah Brightman had a minor hit with Who Want To Live Forever.
My personal favourite would be Don't Stop Me Now by some pop artist. The song wasn't as big for Queen as it would have deserved to be. Maybe some of today's stars could rise it to the top?
There are some songs I think should be left alone. Such songs are Queen masterpieces like Bohemina Rhapsody, We Will Rock You, We Are The Champions, Innuendo and The Show Must Go On. This still leaaves us with a huge amount of great songs that aren't very well known to the big audience.
Not those are losers who fall, but those who don't stand up.