[EdHominem]

Sidechains are an answer, for you, if you don't feel the current blockchains scale for your needs. For micropayments, or whatever. But they don't solve anything per-se because nothing is broken.

Pay to publish is a feature. It's the rate-limiting mechanism we'd need anyways, but directly tied into PoW and reward.

Make your coin and ask people if they want to use it instead of bitcoin. It's so easy, and you can be proven right.