Given that MiX did not jump on the 'Holo' wagon, did not emulate the 'Material Design' trend, and never changed into a 'Material Design 2' interface ... My hunch is there'll never be a 'Material You' version either.
I know, I'm not Hootan. Just an educated guess, based on history.
A reliable, useful, consistent interface that bucks Google's anemic attention span and adoration for wasteful blank spaces that puts two lines of information where you can very comfortably fit 8 lines, is a good feature to have, I would say. By Material Whatever 2027 we'll have a single letter onscreen, dark grey on black.
(^_^.)
There are a variety of wonderful themes and skins available ( yet another unusual and almost quaint feature from software's golden age ! ) that might make it look more to your liking, though.