My honest opinion - Due to CRRC repeatedly having quality control issues regarding passenger safety, I think they should pass the contract to another rolling stock manufacturer that is reputable, be it Kawasaki, Alstom or Siemens. Given that the NYCT's R142/A's, R143's and R160's for example had little to no issues running passenger service, the 1400's and 1900's would've had a much different outcome if they were produced by these companies otherwise rather than CRRC. Not to mention, the least that the MBTA could've done was to keep running the 1200's for a couple more years since the month-long shutdown.