Probably not in any broad sense. More resolution is generally beneficial, but the megapixel race slowed because extra pixels began offering smaller real-world gains than improvements in other areas like color, lenses, and overall image quality.

Ultra-dense prints may be worthwhile for specific use cases where maximum detail is the priority, but they don’t change the basic tradeoff: once you already have enough resolution for the intended print size and viewing distance, other factors often matter more.

Also, print quality is ultimately judged by the print itself, not just by pixel math. In practice, very good large prints have long been made from comparatively modest digital files when the image, processing, and printing are strong. That suggests extremely high print PPI can be impressive, but it does not automatically make ultra-high-megapixel cameras necessary for most photographers.

So: worthwhile as a niche or premium printing approach, yes; likely to broadly “reopen” the megapixel race, no.