The F100 is been replaced world over by the EMB-170/190. But the F100 still serves WA well based on its payload uplift out of hot high ports (Newman, Argyle, Mount Keith etc). I am not sure whether the E-170/190 can lift these payloads out of these type of airstrips, maybe it can?
But at a unit cost of around $6 million or for a very good example maybe $8 million, this is considerably cheaper than one would expect to pay for a E-170/190. You would have to fill a large number of seats to make the E-170/190 make as much return as the F100 would.
Off topic just a bit, but can any E-170/190 driver confirm that the aeroplane only has one autopilot and it cant handle Engine out Inop conditions, ie: You have to disconnect the a/p when a engine fails. Secure the engine, and then the a/p can come back on once the engine is secured. Heard this the other day and found it hard to believe for such a modern aircraft.
Kim-ex.