By Moore's Law, we can expect hardware speed to be 10 times faster in 5 years and 100 times faster in 10. Even if Bitcoin grows at crazy adoption rates, I think computer speeds will stay ahead of the number of transactions.
Did it increase by tenfold in 5 years? Not even close. Satoshi did not have the adequate data here.
There is a lot of processing power being untapped right now. This is typically found in GPUs though:
Not in my GPUs.
I typically use Intel HD when my processor / board supports it.
When I build a Xeon box without Intel HD GPU, well then *if* I install a video card at all it is Geforce 405 w/ 512MB of RAM, clearly not a powerhouse as it gets all the power it needs from the PCIe bus meaning it at most pulls 512W (that model is intended for OEMs but you can find it you search. Also comes in 1GB of RAM but 512 MB suffices for me)