The thing is even if SpaceX gets actually cost down to ridiculously low prices it's still going to be extremely expensive and very very hard. We have practically speaking no experience manufacturing in space, the only thing that's been made have been small test quantities of ZBLAN fiber and until we get asteroid mining and refining setup the extra cost of lifting all the raw materials is going to make manufacturing in space only viable for a few small things with high margins of return.
You'd still need it LEO at 500km varies between 10-700 nPa and UHV is a max of 100 nPa. It's too variable an environment to really develop chips in due to space weather and the variability in the extreme thin reaches of the atmosphere in Earth orbit.
