Fantastic stuff, and hopefully more people that love them can go see them - but it's not the same pull as any of the currently globally famous (even Oasis included, even though I personally hate them).
You want a big name for a big concert to fill a big stadium, as that will generate all the hype and everything to go with it, and I'm sorry but both Springsteen and Billy Joel are no longer that. They'll have demand for sure, legendary musicians in the own right, but they're 75 years old and it's just not the same, and I doubt they'd be filling 50k there which is what we should be going for.
As much as I hate these types of acts myself (and would probably prefer Springsteen between them
) - Oasis, Taylor Swift, stuff like that will generate a lot more and catch a lot more eyes to showcase the stadium.
As a fresh example locally to me - over the summer locally we had rock classics like Judas Priest, metal artists like Megadeth, Corey Taylor (solo work), a random Andre Bocelli concert, yet what is the gig of the year and had people camping outside the stadium and in the park was Ed Sheeran, that is still talked about, a month afterwards, as the biggest one in ages. We need more of the Sheeran-type than the Legends-type, basically, which I know will rub people the wrong way as I also dislike it, but makes more marketing sense... provided we can drag them to us obviously.
As for the price - all the old rock bastards can do one. Wanted to go see Sabbath in Glasgow all those years ago for their crap God is Dead album and the knobheads were charging something like 130 quid for the worst 'seats' in the venue. ACDC likewise. Love them but FFS it's like they forgot it's supposed to be the everyman's music.
But yeah, as someone else above said, we'll play matches and stuff before we host events anyway as there's likely too much risk (and red tape) to rush into that.