Of course you can technically call the database that stores all the recipients of your newsletter a “mailinglist” but what’s the point? To start with, professional newsletters are usually not distributed using a mailing list software like mailman or sympa. Newsletter software has features like personalization of the newsletter’s content based on user settings (i.e. every recipient gets a different email) or tracking if emails were open and links clicked, both of which make no sense in mailinglists.
But, questions of definitions aside, my point was merely that just because every blogger is trying to get your email so they can send you all that useful information they have for you, doesn’t mean that mailinglists are celebrating a revival.
If you want to question whether they are dead in the first place, that’s an entirely different thing.