"What should a company that launches 98% of the world's non government tonnage to space (80% if you include the Chinese government) be valued at ?"

The TAM of that is under $10 billion. So even owning that entire market shouldn't get you anywhere near a trillion. Then factor in the development cost of starship which has been going on forever and still hasn't even made it to orbit.

Even the IPO filing isn't claiming the value comes from the rockets but from data centers in space which seems questionable. The real cash cow right now is Starlink but they aren't leaning into that heavily because those numbers also indicate that revenue growth might be stalling out.

If you just look at the pure numbers the case is very weak. No reason to change the inclusion rules. In fact I'd argue they never should change the inclusion rules. Let the market find a price first. Index funds are supposed to be boring and track the market. Including any recent IPO just adds chaos beyond simply tracking the overall market. It's trivial to buy some SpaceX if one wants and unlike selling your entire fund holding either doesn't trigger a taxable event at all or it's a much smaller one if you cannot avoid it.