The Japanese aircraft too closely resembles the E-jet. Most companies will not want to go with an unknown replica over a known and proven aircraft.

The Russian aircraft will very likely not find a market in the US. Ever.

The Chinese jet will probably be popular throughout Asia and enjoy some limited success in Eastern Europe. However, like the Russian airframe, it will not find a market in the US.

The E-jet and larger CRJs are going to continue to be the staple of North American small jet fleets. When the C-series rolls out, it should do quite well, assuming the geared turbofans deliver the promised performance with great maintenance reliability.