I’m sure some people said the same thing about the Victorians at the beginning of the 20th century. Now you better not modify or stray from the original color schemes or you will be hung by your thumbs from the courthouse roof...
The McMansions won’t last 100 years. They’re more like stage sets. The trick to building them is to use the least expensive materials, then pour money into countertops, fixtures and appliances, etc.
One big difference between a McMansion and a Victorian is that Victorians were built to last.
McMansions are expensive piles of cheap plywood and vinyl. Victorians were built of high quality wood and plenty of it.
My solid Victorian (& nobody had to coerce me to paint it period colors) will easily last another century; what will happen to Hummer Houses? Maybe McMansionvilles will become Illegal-Immigrantvilles.