That's right, I'd forgotten than Viking took the Q400 as well. Perhaps they'll rename it the Dash-8. But it is an over forty year old design targeted at low cost commuter airlines, so I wonder if volume production can be justified by orders.
There may be sales to be had in Europe (but that's
ATR territory), but in the USA none of the ten largest scheduled passengers carriers in the U.S. nor any of their regional subsidiaries operate turboprops in scheduled passenger service. Turboprops are dead in the major carrier U.S. market.
If I was Viking I'd stay away from the scheduled passengers carrier business. Stick with your niche of specialized and novel aircraft types. A big Q400 order from a major airline might look good on the books, until the airline goes bankrupt before payment.