I don't think they'll disappear completely. After all, from a marketing perspective, companies need to somehow move their product forward, and that's a kind of fuel for momentum. But their numbers will definitely decline. And it won't even be because people don't want to make them, but because the development cycle has increased exponentially (if we're talking about large projects, and most exclusives are usually AAA titles), and the number of games released by a single studio has also sharply decreased compared to what it was back then. (I'll remind you that there was once a time when they managed to release three Mass Effect games in a single console life cycle, now they can't even produce one.)