No physical quantity can continue to change exponentially forever. Your job is delaying forever.
Moore's law is really about economics.
It is extremely unlikely that anyone coming out of school with a technical degree will go into one area and stay there. Today's students have to look forward to the excitement of probably having three or four careers.
If everything you try works, you aren't trying hard enough.
Most of what I learned as an entrepreneur was by trial and error.
I remember the difficulty we had in the beginning replacing magnetic cores in memories and eventually we had both cost and performance advantages. But it wasn't at all clear in the beginning.