very vocal about the Embrear, they are incredibly expensive to fix when broken, cost a lot to operate compared to the 737 or A319
Have you got any links or evidence of this "very vocal" attitude to Embraer?
My information differs from yours markedly. Virgin decided to remove the Embraer not because of "brakedown" sic issues but because they wanted to reduce the number of aircraft types that they operate. The people I know that flew them said they were good aircraft to operate and pax liked them. In what way do they cost more to operate than a 737 or 319? Given less seats their costs may be higher per RSK but their capital cost is also half of the other types.
You mention two carriers "dumping" the type, so worldwide not really a significant number.
A one aircraft fleet is difficult to sustain admittedly but without seeing the business plan, who knows.