the problem with blockchain is not only the size but also the huge bandwidth it is using. many countries now has no unlimited internet bundles and when they finish their packages the speed gets very slow. so why would I spend my internet on something I do not have to ! which is running a node
I read that currently it takes about 200 GB a month to run the node for bitcoin only. Imagine some downloads or streaming movies through netflix etc, you could start hitting the limits of your connection quite fast.
And even with unlimited bandwidth, most providers have fair use policies which indeed may throttle your connection or even get you warnings to lower your data usage and ultimately getting cut of completely.
I still think a lot of bandwidth can be saved by using smaller chunks of the blockchain by many users instead of the whole thing by few users.