What makes cathedrals special?
They are large, impressive, beautiful and usually old. The Temple was not old. They are designed for worship with a lot of people, so you get the sense that you are part of something big, not just the local community. They are the keepers of tradition and history. And they give enough space to be bale to find a corner and pray.
But they are not a national insurance policy, which is what Solomon seems to have envisaged.