If by new business we literally mean startups, then that has been the case basically forever, even back in the 60s and 70s. Mainframes were never really for new businesses in the startup sense of the word. The barrier to entry has always been kind of extreme. So the big customers even back in the day were always old insurance companies and banks and governments etc. It wasn't really until minicomputers that "new businesses" doing computing at all was feasible.

So in that sense, not much has really changed, and for the target market of the product, I don't think it makes sense as a good metric for whether the platform is dead or alive.