Potential revenue stream I am not saying the following is going to happen, but there is a better chance of it happening now then before. But alot is dependent on market condition.
With CRJ under Mitsubishi and now no direct competition between Mitsubishi and Bombardier. Both dont have C series and Spacejet to compete against each other and EMB only one in regional market. There is room and airlines preference to have another OEM for competition.
Mitsubishi has the services and after sales of CRJ but no new airplane. Bombardier has the airplane but no appetite and regional market presence.
Global 8000 is ideal replacement for new regional jet. Few tweaks like removal of self supporting equipment used for charter bizz jet and ultra long operations (reduces weight too), de rated engine (GE got this covered), and new wing for short regional flights. This will make Global 8000 airframer and excellent RJ. Minimum tooling and ramp up cost will be required plus both Mitsubishi and Bombardier can split cost.
Bombardier takes care of design and build, and Mitsubishi sales and marketing. Aftermarket sales can be shared as thats where regular revenue will come from.
Bombardier took Challenger jet original jet and stretched it into CRJ series. Global 8000 needs no stretch so R&D will be low.
Again this might not happen but potentially is there. Embraer doesn't have money to bring any new airplane for RJ as they are tired with new turboprop design. And they have pricing pressure form Airbus for E2 series, Bizz jet competition from Cessna and lower end Gulfstream and Bombardier.
If it does then there is another revenue stream. This is would be 4 to 5 years out as current RJ have that many years to go before heavy replacement cycle kicks in.