Are you now really pretending that you no longer accept that blocksize increases are a non-solution, and that 12 MB blocks in a few years is a sensible way forward? Are you using the same schoolyard logically subversive tactics as Frankie and jonald, and impugning those who won't get on board?
You are perfectly right that block chain tech doesn't scale well. However, there is a difference between putting in an artificial scarcity parameter, and having a real market determine when the resource cost of the scaling needs to be compensated by fees.
You do not agree, but it is a very simple fact that non-mining nodes have nothing to do with the decentralisation of bitcoin. The only thing that counts is that respect is the decentralisation of proof of work deciders (mining pools), which is at this moment an oligarchy. So bitcoin is on the brink of being centralized in any case, and the "node network" has absolutely no power to counter that, no matter how many blindspots you have there.
If bitcoin had a free block size, or an automatically adapting block size, it would be able to cope with adoption up to the point of technical limits, essentially given by network capacity between mining pools (we really, really don't care about nodes) and their server capacity towards user wallets. The loon guy wanting to check the block chain for himself can buy enough storage to verify the Peta-byte size block chain if he wants to. But that doesn't matter. To give you an idea, I buy now 1TB disks for less money than I bought 1 GB disks in the 1990-ies. So PB size storage is probably not going to be a problem 20 years from now. My internet link went up also by more than a factor 1000. So downloading a PB block size during a week is going to be just as fine as downloading a TB size block chain right now. So the scalability is limited by technology, but technology is improving.
But now that bitcoin has a protocol built-in block size of 1MB, it is for ever limited to 2-3 transactions a second, which means that bitcoin can only be a reserve currency.
Maybe a lightning network by banks will be built on top of it. But it will be like normal banking, where normal people will have a bank account, and the bank will use bitcoin to settle with other banks. Those banks are nothing else but lightning hubs, using bitcoin as a reserve currency (and going for fractional reserve banking, IOU, and all that, like normal banking).
But what is sure, is that bitcoin will not be used any more directly by normal users for normal transactions, as a currency. That epoch is closing with the 1 MB limit.