If they're going to limit monorail hours, then they need to decrease Deluxe prices because they've reduced one of the incentives of staying there.
Given the relatively high load-levels at the Disney resorts, including the deluxe resorts, they probably don't need to decrease the room rates in response to this.
Even for someone who does stay for EMH, the difference between taking the monorail and the bus is a specific amount, divided over the entire vacation (since there is practically never two evening EMHs at MK the same week)... so even if there needed to be some reconciliation, it would be pennies, given how little impact this will have on the average guest, which is what would impact whether they need to decrease deluxe resort room rates or not.
No doom and gloom. . .just personal inconvenience that I would hope to avoid on vacation.
Yup that makes a lot of sense, though to be fair, there is no way to avoid all inconvenience on vacation, and in contrast to some of the other inconveniences we encounter, like having to wait 45 minutes at the airport for a DME bus, I bet this one is going to be pretty small for most people.
Really expensive.
That gives me an idea...why don't they cut the Electrical Water Pageant and give us back the monorail?

Putting on my flame suit now
I think it is a good question though - I suspect that the answer is going to be, "Because the monorail costs a lot more to operate than the EWP."
That said, all reports have been pointing towards the monorails needing some serious TLC. Or complete replacement.
Or removal. Monorails are expensive. They were a great attraction at the start, but the attraction value is practically gone, except among guests who would likely either return visit anyway or find some reason, any reason, not to return, because they've become jaded.
It seems like the monorails are much more expensive to operate than they're worth in terms of attraction value. I suspect the only thing preventing Disney from doing away with them already is the concern they have about negative PR invoked by WDW fanatics. So in other words, they're not keeping them because the monorails, themselves, are worthwhile, but rather because
getting rid of them isn't worthwhile. I think they're similar to CoP in that way, and likely to receive the same treatment (less frequent hours and such) for as long as guests fail to appreciate monorails to the same extent that they did thirty years ago.