Well, if DLR starts performing better fiscally, and WDW starts performing worse fiscally, it should send a message that maybe the DLR business-model is the one that should be followed at both parks. I realize that it's highly improbable that this one event will cause that to occur, but it could occur over time. Just like if ticket sales were $300m for Cars 3 but only $30m for Pirates 4 (obviously not the actual case, used for illustrative purposes only). Which one do you think would get the "future investment" of another sequel?
Of course, the problem is that if it did occur at the parks, Disney would likely just concoct some survey to explain away why it happened and bring the same cuts to DLR.
As for this news in general, I think it's very indicative of "Declining By Degrees," and regardless of whether Disney expressly advertises "full-time monorail service at the Deluxes," guest perception is what matters. If this causes a decent number of guests to jump ship and stay at the Swlaphin or even a Disney moderate, then it was a bad (business) decision. If bookings don't really change, and only a few fanboys online (many of whom probably don't stay at Deluxe resorts anyway--so truly their opinions don't matter) complain, it's a victory.
We've never stayed at a MK Deluxe, anyway, so I really can't get too up in arms over this. It does re-affirm my decision to stay at the Epcot Deluxes, though.