I doubt it. If you consider the fact that Poppins is (at least on Broadway) considered to be a Disney show and is playing in a theatre that is operated and leased out by Disney. I don't think that that is a theatre that they want to have dark for any amount of time. Wit that being said, I do think that the show will stay open for a year or so more. Keep in mind that now is a bad time to judge grosses due to the fact that every show is going to show a dip in sales now, due to the fact that summer ended and the tourists have gone home until the holidays.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll