The block time set to 10 minutes is permanent so changing that would be infinitely harder than changing the 1mb cap which has always been a temporary measure from the start.
Change something permanent and you open Pandora's box to future permanent things changing. Then nothing is permanent, and nobody trusts bitcoin anymore, and becomes worthless.
This. I guess people don't think about this in the proper way. There a specifications that should not be tampered with. Changing them would cause problems in regards to trust.
Bitcoin has decent block times. There is no need for very quick transactions as this system is much faster than what the world already has.
Although if we want to see more transactions over the network we have to provide enough room for them.