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Now we can't exactly predict size of Bitcoin blockchain but looking at this
Statista chart, I think we are not going to reach even 400GB or 500GB in next few years, and data from
Ycharts is showing 142.6% Average Growth Rate.
And since we've had an exponential growth in computer storage capacity so far, and there's no reason to expect something dramatic to change in the foreseeable future, I don't believe we're ever going to get into trouble storing blockchain data.