UngeheuerLich
Legend
I really don't think so. At some point you replace your old things anyway. After 10 years spending another few bucks is reasonable and it pales compared to the maintanance cost of other hobbies.Perhaps. But D&D has been enjoying an unprecedented moment of cultural relevance for almost 10 years now, and it surely has to end some time. A good candidate for that would seem to be the moment when WotC try to get lots of people to replace their $150 core rulebooks with some mechanically-similar $180+ rulebooks.
And with them betting big on D&D (with huge print runs and all the investment in Beyond) and with Hasbro relatively struggling and thus depending on them... I hope it works out for them, I really do. But this is also a moment of not inconsiderable risk.
A better way to kill ot off is forcing new people to buy 10 year old books that are a bit outdated if you look closer (with tasha's guide's optional class features and xanathar's new encounter building rules and downtime activities).
At some point you have to face it. You are not the prime target audience anymore. If you actually replace your books, it is a nice bonus. Most money comes from people getting into the hobby.