Maybe ... but if everyone at the table only cares for the most basic rules elements, because they can't really be bothered with the rest, I'm not really sure why I would choose 5e if I could just as well use something cheaper and slimmer that provides similar rules depths as the most basic 5e experience, like something based on Fighting Fantasy (Warlock, Troika) or a Freeform Universal game or a light pbtA variant.
I didn't mean to take away from your point that 5e may be a great enabler for "mixed group play", where some use the more complex bits and others stick to the basics. If 5e truly succeeds at that, it's a great feat. But it still wouldn't convince me to play 5e, because really, I think none of the people I usually play with would be interested in having more than one or two class-specific abilities to memorize.