Both Uni and Disney have had issues with getting complicated new attractions and technologies to work ten hours a day every single day. We've seen fabulous, new attractions have constant breakdowns over the course of months before all the kinks are worked out.2 coasters closed for 2 days is not a good show.
And some of the issues aren't easy to diagnose let alone fix.
I hope EU can pull it together and be successful. But, I wouldn't be surprised if it turns out disastrously. Getting one, new E-Ticket ride is a huge undertaking. Getting six of them up and running all at once...