I think the Stein's Law is relevant here: "If something cannot go on forever, it will stop".

I also think that you have to be careful about being clear the growth of what are you talking about. I suspect that there is no universal growth curve for all technology (or for all "knowledge industries") and particulars matter. Economic growth, for example, is very malleable (it's basically "more of stuff that humans value") and so can morph in time. But the density of information storage, to take another example, has clear limits, at least according the current physics, and so its growth, even if exponential for a time, is ultimately limited.