Billy Corgan melted faces, shredded souls, rocked silver pants, screamed and and acted every bit the young hungry rockstar he was.
William Patrick Corgan is a millionaire who wears healing crystals, owns a tea shop, sings with vibrato oozing over everything and braids prayers (whatever the fuck Jessica Simpson meant by that).
The full fire will never return without him magically de-aging 20 years. The best one can hope for is he stops surrounding himself with yes-men and gets people who can challenge him to write something with a bit of bite. I don't think age is the end-all be-all deciding factor, plenty of older artists can create poignant works, but the anger ain't coming back. Something that sounds inspired is about the best one can hope for.