Doubt it. DVDs are much cheaper than any flash storage, but internet is even more cheap ;) there's a point in assuming that DVDs are for novices though.

DVDs aren't in much use for some time already. from my observations very few people still using it for the purposes different than OS installing. I was absolutely happy to replace DVD by a HDD on my laptop, and I think we can expect OSes to be installed via internet in a couple of years, everything's ready for that.