It really is just one more reason to avoid Disney hotels.
No, that's not the case, and I think it points out one of the disconnects in this discussion: It is not "one more reason to avoid" Disney hotels. Rather it is one less reason to choose Disney hotels. So given 100 reasons to choose to stay on-site, now there will be 99. And the numbers are actually generous to your disappointed perspective, because the monorail service is being cut back less than 5% (perhaps less than 1%), and monorail service is just one of many reasons to stay on-site.
I wonder how any Bay Lake Tower owners feel about this, surely the Monorail providing transportation would have been some factor in Disney's selling pitch, right?
For most, it will be a flyspeck, since they can still just walk back from EMH. Most of the BLT owners I know are in the avoid EMH camp anyway, so they'll be unaffected.
It is interesting that they are making this change before GFV goes up for sale. Those buyers will have no excuse if they fail to learn of this change before buying, but I suspect some will still whine about it after-the-fact.
One argument that I never seem to buy even though 1000's of dissers here swear to it, is the "cutbacks" every where mentality. I truly don't see this in other vacation venues. Cruises, beach packages, Vegas, all seem to offer way more quality for the same dollar spent.
Oh my gosh Eliza, I really need to introduce you to some other people.
Go over to Cruise Critic and ask if cruises have experienced cut-backs over the years. There's a guy on Cruise Critic who is a chaplain and for a religious man he sure does have a great propensity for negativity with regard to the works of others.

He and others will inundate you with hundreds upon hundreds of specific examples of cut-backs.
I can talk from personal experience about staying in cabins and rental houses in the White Mountains, in Maine, and at the Jersey shore. It's insidious because it's such a cottage industry, but the quality-for-rate-paid is plummeting in the long-term. Putting aside the technological enhancements, like Internet access (because you're ignoring them at WDW, as well, aren't you?) the compromises and the general decline in quality over the years is undeniable. Can you find "better" accommodations now? Absolutely, but you're paying a lot more, adjusted for inflation, than you were in the past.
Heck, just go of to Flyer Talk and ask them about declines in the quality of that aspect of vacations that get you too and from the vacation. Rental cars. Restaurants. Luggage. On and on and on. Every last little bit of every aspect of practically everything has been on a sure and clear path toward optimized profit. As long as we're a capitalist nation that will, and should, be the case. All these service providers are actually understanding their customers, now, far better than they ever had in the past, understanding what they really are willing to pay for, and giving them that and charging what they understand their customers are willing to pay for it.
Whether my perception is valid or imaginary for me is a moot point
No, sorry, Eliza, it isn't a moot point. If you convince yourself that things are strange at WDW, when instead it is experiencing the same trends just like everywhere else, then your perception is leading you to the wrong conclusions.