An expectation of a product creates a product. And a product (can) create(s) demand with or without that expectation.
Of course that won't happen as aerospace is such a strategic industry.
Multiple aviation projects have almost bankrupt Bombardier in recent history, so I don't really see them getting back into it. And it's hard to see what BAE Systems would get out of entering the commercial aviation market.
Um let's be serious. Hard no on those.
The even bigger problem is that our governments allow companies to get to these “too big to fail” states, and I myself am pretty tired of it. Every single time it is the consumer that pays, either literally or with their lives.
It can't be good for innovation or the consumer if a giant established player is getting preferential treatment.