I don't think it's a question of "afford" but a question of "How does it look on a spreadsheet?"
I don't think the Monorails look good on a spreadsheet and I think that "how it looks on a spreadsheet" is how the current managers work.
I'm not saying that the Monorail will be shut down later this year but as another poster has said, I think many of those reading this will see it happen in their lifetime.
You can say, "I can't imagine the Contemporary without the Monorail." Yeah, I get that. Imagine Tomorrowland without the Peoplemover or the Matterhorn without the Skyway going through it. Things change, you'll get used to the changes. If they were to shut it down they'd just close the garage doors on the Contemporary and you'd see dead beams for a decade or more. You'd think, "I remember when," but it wouldn't matter and you'd get used to it.