Since the Model was conceived in the 80’s is it relevant today?

Gravity was “discovered” thousands of years ago and is still relevant today. I’m being a little sarcastic here, but my point is simple: The model was relevant in the 80’s and is VERY relevant today and will be down the road as long as there are Customers to satisfy. Any time anyone is developing a Product, Service, Software Application, or Business Process that has customers to satisfy, it is relevant because all Customers have “Basic and Performance” needs and when there are many choices, “Excitement Needs” often are great “tie-breakers”.