I guess I am one of only a few who think that it would be a good thing if some of these old shows closed down. A couple of years is more than enough for just about any show. And for most, one year should mean its time to close and go on the road.
Any number of shows that had less than 50% gross this week could close without anyone thinking it a tragedy -- American in Paris, Chicago, Neverland, Jersey Boys, Kinky Boots, Matilda, Rotten, Dog, and yes, Phantom, could all say Adieu and Bientot.
Winter is a good time to cull the herd and make room for the next generation.