Comment: Not true

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Not true

It's not true that everyone has to download the full blockchain. Most people use lightweight clients that don't do that. https://en.bitcoin.it/wiki/Scalability

But growth of the blockchain size is a known problem, since it records every transaction ever made. Add it to the list of things that competitors will address by designing from the ground up based on seeing what bitcoin got wrong, and that bitcoin will have a hard time addressing. The competitors that are out there now are mostly just clones with parameters tweaked to shorten confirmation times and other small things, but a new generation of competitors that aren't just clones won't be far behind.