I just don't think this is true - especially in the era of a new iPhone every year. Now I personally am setting a record, I think, with having the same iPhone 7 for over five years, but most people seems to get a new one every 2-3 years.
Meaning, good or bad, it is the nature of the consumer treadmill, and I don't see why D&D needs to be any different. And again, we're talking about a 10-year update. What you say may have been true if, say, a "revised edition" came out after a few years, but ten years is a long time. My guess is that most of the new players will be/are excited about it - as the first major update they've experienced. New books! Shiny new covers! Updated rules! Etc.