Having an interest is not enough. We need to guarantee the ability for the common man to do so.
The free market will solve your problem because there is an incentive. https://bitseed.org
look at that brg444, look at it closely its cost 160$, and i bet you we can get this sexy piece of shit to handle 4K TPS ( might need a HD upgrade tho)
it might be challenging to get this very minimal computer to process 4KTPS
but it would serve as a good benchmark as to what we would limit the requirement for a full node to be.
http://www.truthcoin.info/blog/measuring-decentralization/
at 160$ the cost of the machine is negligible and in most cases 0 because the user already has a computer 5X more powerful.
the bandwidth it would use is the costly part.
unlimited bandwidth plan would be required.
Sure, not a problem if you live in Montreal. If you live in China, India or other third world countries then you're just screwed I guess, too bad for you right