The artificial block size limit
Alex B.

For the many reasons explained above, it should be clear to everyone that the current block size limit is hardly artificial. It is, rather, a conscious, voluntary, decision by network participants everywhere to preserve the trust minimization feature of Bitcoin.

If we upgrade the system with Bitcoin Unlimited and let the market set the max blocksize limit, it will also be a conscious, voluntary decision by network participants. In fact, the participants are getting fed up with Blockstream/Core choking bitcoin at three transactions per second and stalling progress, so this will likely happen.