For the sake of the poll I voted for trunks/no mask/no gloves; Kryptonians extinct; and secret identity. But really for almost all the categories, while I support these ideas, I'm open to other directions being explored for long periods of time. However, a poll doesn't make for an open and free wheeling discussion--it forces one to take positions.
I think ultimately, the character goes back to the basics time and again. It's the going away and coming back that allows some creative freedom. I'm for the Kents being dead--but this is an ultimate outcome--even when the Kents are alive, one or both of them ends up dying and their death was the status quo for 50 years straight (although other media took different approaches).
There have been single issue stories and extended arcs that explored all the ideas in the poll--and not just recently or since COIE, but going back to the early days.
Superman has had costume changes; there are stories that told of Superman ending up with someone else not Lois; Clark has held down other jobs and even worked at WGBS for 15 years; there have been long periods where it seemed like hundreds of thousands of Kryptonian survived the dying of their original planet; Superman has gone through periods of complete power loss, changes in his power set and the development of new powers (if that didn't happen he wouldn't have his vision powers); Clark started out living in a completely different city from Metropolis; several stories have explored the idea of Superman giving up his Clark Kent identity; Luthor wasn't always the arch-enemy and his status keeps changing; Kents have been dead (as I said); supporting cast characters have changed and the introduction of new characters is the best way to keep the series fresh.
In fact, exploring these ideas accounts for almost all the Superman stories ever told.