The market would move on. Now, between Black Flag and the other 5E-compatible systems coming, there's going to be an alternative available to 1D&D before 1D&D ever hits the streets. Publishers other than WotC can put out material with confidence, without worrying that everything they're making will suddenly be for an obsolete system. People who don't like 1D&D will have off-ramps they can choose before 1D&D ever comes out and will be able to have confidence that Kobold and others will continue to produce content they want to consume.