If the bitcoin community decided to send transactions at the maximum rate and all miners were to produce 1MB blocks, at 1 block every 10 minutes 50.6GB (51840MB) will be added to the blockchain per year. It will take 20.2 years to add 1 terabyte to the blockchain.
A 3TB drive commercially available today will be able to store the blockchain of a bitcoin on steroid for more than 60 years.
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640K 1T ought to be enough for anyone".

What happens when bitcoin volume grows 10fold. Wouldn't some transactions not get into blocks, slowing down the transaction speed. What's the solution to that