The hired guy would just sit out the encore so that Nicko could drum.
And in an ideal world, that sounds great. But if the shows start to suffer, a la the dirge tempo of Aces High, then I'd rather have 5 guys who sound great with some random drummer than 6 guys who sound slow and tired simply because Nicko wants to keep going.
Ideally, we'd all love to see that. But if Bruce still sounds good and the other guys want to keep playing (and Rod wants to keep making money), I would have no issues with a fill-in touring drummer. Also, Steve says a lot of things.
Anyway, I'm not trying to bash Nicko and I think he still does a great job, I'm just trying to be realistic. I love Nicko and his contribution to Maiden is unbeatable. But I'm legitimately shocked at the number of people who choose No Maiden over Maiden without Nicko.