The SJ30 is a beautiful design but it's 30 years old (launched in 1986)! It's tiny inside, really cramped cabin, it's too expensive at around US$9m and there simply isn't the vast sums of money behind it to sustain production, support it globally, evolve and update it through production. It's day has been and gone. Yes, it has amazing performance, still, but the chances of it surviving are minimal where it only fits a very niche, very small corner of the market, great for the rich owner-flyer pilot enthusiast sitting at the front end, but not so great for the family in the back.
The industry has seen a multitude of startup jet designs, and the odd turboprop too, of which the vast majority fall by the wayside. The sums of money required to maintain production, certification, product support, product improvement and upgrades, modernisation etc. are simply staggering. The cash will run out in a blink of an eye, ask Bombardier how much you need.