Yes almost certainly we can keep speeding things up, just a lot more slowly than we are speeding things up right now. There's a lot of room for improvements in

Yes almost certainly we can keep speeding things up, just a lot more slowly than we are speeding things up right now. There's a lot of room for improvements in more specialized single-purpose hardware, more different sorts of cores tuned for different workloads, and academia has a lot of ideas for algorithmic improvements too. But don't expect these to provide the same rapid increase in capabilities that we've seen with transistors shrinking. Eventually we'll have nanotube transistor or photonic or spintronic or nano-electro-mechanical or quantum computers. There are firm physical laws saying what the limits of efficient computation are and we haven't reached them yet.