There are already pipelines in the Arabian Peninsula. None of those help - on the contrary, they are more vulnerable than tankers. The Houthis have already targeted the Saudi pipelines in the past.

The only possible solution would be underground pipelines but a.) sunk costs into existing pipelines, b.) capex needed is much higher, c.) you can't transport all of the oil and gas, or even a significant fraction of it through standard sized pipelines.

Saudi Arabia will invest into a port on the Jeddah side, that's for certain.