All of those features are here to stay, especially the latter three since they're mostly a function of having lots of space. One feature that will date badly is

All of those features are here to stay, especially the latter three since they're mostly a function of having lots of space. One feature that will date badly is the bland white/beige/peace/flesh/etc paint palette; in a effort not to offend anyone, it ends up pleasing no one. How about some, blue, red, and green, as so many gorgeous 19th century houses had?