Sadly true. The realities of F1 and the infrastructure requirements to put on a successful F1 event, truthfully, do not lend themselves well to WDW hosting an F1 race. The needs far exceed simply having a piece of property that could contain such an event. Also, the F1 calendar is already full (true). All that said, it would be quite an event IF the powers that be would ever want it to be.
However, that does not preclude (heaven forbid someone / or some persons with some imagination) developing a venue involving slow speed LEGO F1 race cars that guests could operate. Fully functional (low speed) LEGO F1 cars were already debuted at the MIAMI GP. Just saying.