This is incorrect. Firstly, it's 10 per second. Secondly, it shouldn't be all that hard to imagine "side chains" or even "local-party networks" being built to handle transactions and use the underlying blockchain as a settlement mechanism. This is, as I understand it, how the lightning network works/will work, and I see no reason to think it wouldn't improve Bitcoin's adoption, which is already orders of magnitude better than other cryptos.