Margins remain about the same as they have for the past decade.
You are entitled to your opinion about giving "less for more", but the health of Apple as a company shows you are in the extreme minority.
No doubt some extra margins going on in here:
https://www.macrumors.com/2018/11/01/apple-no-unit-sales-data-earnings/
Apple is perhaps making this change because its unit sales are decreasing while revenue is growing due to rising ASPs.
I've always said the future of Mac is iPad so I'm not bothered about neglecting a product line that has a limited life left in it.
The iPad is different enough it will likely live on as a separate device unless they radically change it. I can count on one hand the number of times I see an iPad on campus in an entire semester, and have not seen one once in any of the classes I've been in.
Between the ergonomics of the device and the limitations of iOS, Mac will be around a good while, getting things done.