The race to produce these 70-100 seat airliners is really interesting, considering the history:
Fairchild-Dornier -- Bankrupt, never flew.
Fokker 70/100 -- Bankrupt.
IPTN (Indonesia) -- Never flew.
BAE 146/RJ -- Out of the airliner business.

And these slightly larger versions:
Boeing 717 (actually a DC9-NG): Out of production.
Boeing 737-600 -- very few sales.
Airbus 318 -- even less.

So now we have new ones from Embraer (in production), Sukhoi, Bombardier ( if the C-series is ever launched, the current largest version is an over-stretched biz-jet), and coming up soon the ARJ21 from China. The market may have changed but there's still too many competitors.

I don't expect to see Sukhoi selling many in China which is producing its own direct competitor. It'll be interesting to see how it does in the West. There was a good deal of Boeing involvement in the project at first but that's pretty much gone by the boards.

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