So some carefulness is not wasted. We will succeed simply by not failing. The seeds of success are sown into the fabric of the Bitcoin code and architecture.
No, there is competition from altcoins to consider. If we leave 99% of the market on the table because of ultraconservatism about blocksize, we let an altcoin have all that, and Bitcoin gets swept by the wayside. And guess which one ends up more decentralized.
The supposed conservatism or carefulness in keeping the 1MB cap (or growing it only slowly) is entirely illusory. The only position that can conceivably be called conservative is one where the blocksize cap is set as high as is likely to be feasible. The conservative option isn't "do nothing." The conservative option is to set the cap almost as high as we think any competitor will be able to feasibly do so. The network effect will take care of the slop factor, but not if that slop factor is a Texas mile because we didn't even bother aiming.
Patience... Bitcoin is still in beta, its so young. Lets give it the chance to grow up without breaking it along the way.
Over-patience is the same as breaking it. The result is the same because competition is ever-present. Network effect means small mistakes and sub-optimalities are forgiven, and often even substantial ones, but gigantic ones cannot be. An altcoin with
orders of magnitude bigger block capabilities, able to scale on the fly because there is no limit, and experiencing no problems because the conjectured issues turned out to be frivolous...that's a tough cookie for the network effect to swallow.
No one cares about an altcoin boasting 5x Bitcoin's capacity...because it's not Bitcoin. But if it boasts 100x Bitcoin's capacity, that's a game-changer. We have to at least get in the ballpark. Watching from the sidelines is not going to cut it, and I refuse to call that in any way conservative, patient, or careful.