Probably true, but it's because their market (small businesses who just want a basic HTML-only site) has been taken over by website builders like Wix, Weebly, Wordpress, and Squarespace. Agencies & professional web developers moved up-market to the customers who require dynamic app-like behavior, which Dreamweaver and Frontpage sucked at, while the bottom end of the market moved to the aforementioned hosted services that could also run the site for them, handle maintenance, and easily integrate add-ons like email/blogs/commenting/RSS/analytics/etc.