The current model of saving everything does seem unsustainable in the long run. I expect there to be some clever tech to come out that starts using checkpoints to archive the blockchain.
Either that or we have to hope that solid state drives continue to get faster and hold more data at a rate that's quicker than blockchain demand.
I think the tech will grow with the ideas from here on out, if we see how usb stick memory progressed for example
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I hope there is. I suggested it in 2017 as well, to archive older parts of the chain, and put them on legacy nodes that have less frequent access and less demand. The more recent stuff to be on main nodes. Something like that.