In pop and hip-hop it's pretty much all about the vocal (musically - let's ignore brand/image/marketing for a moment). I can't recall any great beatles solo's - but their vocal hooks are (imho) timeless.
When you can blend a vocal with a guitar hook then you're doing realllly well (Aerosmith/Run DMC - Walk this way) but I hardly ever find myself humming a guitar solo/lead (a few notable exceptions, Surfing with the alien - Joe Satriani, Two Princes - Spin Doctor's, John Lee Hooker - Boom Boom Boom, Jimi Hendrix - Bold as love).
I think there's an art to playing lead guitar that was lost in the Richie Sambora/Zakk Wylde guitar hero age - Instead of "here's 16bars for the solo", I'd rather think "what is gonna hook your ear?".
I'd want to focus more about the listener's experience of the song and less about the prowess of the guitaring. Not that G3 pyrotechnics are wrong -someone has to push the boundaries - but there's more to music than "face melting solo's"?