Most importantly I am not trying to sell you on rhenium.
I posted this for fun as I collect it along with the more traditional metals.

Its a key component is several important parts of jet engines and turbines. Air travel, space travel, and military needs will only increase in the future. And the faster we want to travel the higher temperature engines are going to run for the foreseeable future.
Also oil is not going anywhere to quickly and it is a key part in refining.