[syrrim]

The ten MB block size limit lowers the number of transactions that can occur in a single block therefore inflating what miners can charge for a transaction. Increasing the blocksise would require miners to choose to mine a hard fork. See the DAO hack for what can happen with strong governance.

[jstanley]

The Bitcoin block size limit is not 10 MB.

[solotronics]

Without a small block size you would end up with a centralization of nodes onto datacenter servers.

[PeterisP]

We anyway have ended up with a centralization of nodes onto datacenter servers, so it's hard to argue that it would have made a difference.