I wonder how the whole Bitcoin blockchain system will scale in the future. Given the fact that the size of the blockchain will grow exponentially (roughly a tenfold every ~3 years, looking at the recent years) but HDDs only tenfold every ~5 years, this will become a problem.
The conclusion here would then be that individual users could not save the whole Blockchain on their PCs anymore. This, again, would mean that people would need to prune their Blockchains, but by doing so, old Blocks would be deleted and they could not create new transactions anymore (is this correct?).
And by looking at the largest miners, the 51% problem is already a major thing which only would get worse if small players could not participate anymore.
This would then lead to an Oligopoly of Bitcoin masters that could easily control the truth, not so far away from todays centralized banking system.
I hope all my assumptions are correct and somebody can follow up and answer this, thanks.