50% might prove optimistic. The rules that were bent for SpaceX exist for reasons. The August dump will be 4X the shares already in the wild. You are right, employees would be crazy not to sell at current rates. SpaceX employees are probably smart and/or educated enough to read the white papers on all these science fantasy projects and know they are pure fantasy. Cool stuff to fire up investment bros, but not the kind of thing they want to be tasked with trying to make reality. Point being, the floor for what an employee would not sale is going to be really low. True believers might hold, but anyone who smells the BS or just likes money will gleefully sell at 50% of current.
Meanwhile, China is making great strides in VTVL and much cheaper, open source LLMs. The EU is eager to find home grown or at the least not-American tech solutions. Every headline makes SpaceX look less and less likely to make ANY profits, let alone completely dominate supposedly multi-trillion dollar markets.