King Air/1900 is EFIS 84 Saab 340 and I think the EMB 120 is the EFIS 86 I believe. Highly doubt there will be no more support for the EFIS 86. If they do decide to drop the support someone else will pick up the slack in the private market and make a profit on it. The only thing that really fails on these are the CRT tubes and the associated power supplies for them. CRT may become harder to come by but a retrofit will hardly cost 2 million an airplane. Take a look at Sandel's retrofits and you will see that it will hardly cost a quarter of that much.