Considering much of the 'Making Flying Better' campaign is underpinned by using the Ejet, it might not be a bad idea to accelerate those deliveries (if it can be done by Embraer) Imagine all of the disappointed people thinking that they are about to board a shiny new Ejet with wifi and all the rest of it only to be greeted by a tired old Q4; which is still the mainstay of the fleet by a long way. Making Flying Better it does not...
Perhaps one of the reasons for a slow fleet renewal is difficulty shifting the Dashes? I know that the airline will struggle to convert crews over and still cover the existing schedule if new Ejets were coming thick and fast.