Jetblue is the single largest 190 operator in the US. Azul in Brazil and then Air Canada. This fact speak volumes of the quality of the aircraft and the resale value. Much like the A-330/900 the ability to purchase an aircraft, spare parts and potentially resell them in a downturn is extremely limited when you are the only operator hence Hawaiin cancelling their 330 order for the 787. The 195 is a bad idea, there is no other way to put it.
Jetblue airways E-190's require 4x more MX to achieve ALMOST the same reliability as the A-320. Plan and simple the aircraft is not reliable without herculean MX efforts. In addition, Embraer support for the aircraft has been difficult as well. Reports indicated Embraer failed to has answers for many of the electrical issues plaguing the fleet.
Either the 195 or C-series will require new sims and parts(some) but to gamble on the 195 somehow being different to the 190 is idiotic in my opinion. As pilots we will exceed EVERY OTHER EMPLOYEES TENURE at an airline and to see your management continue to make these poor business decisions is frustrating to say the least.
Order the C-series and be done with it.