I think there will be plenty of demand. Most of which is not bothered by price at all.

When the indexes get in -- watch out!

They will have to buy so much SpaceX, that it will force them to sell everything else.

They won't, SpaceX will weigh less then 1% in most indexes, since they're mostly float adjusted, only NASDAQ will overweight them, but FTSE/MSCI/CRSP/SP will not.

It's still quite some money but it won't crush the market by itself.