2.5 years is a very long time in today's market. People are going to remember the price projection today and wonder why, when it finally makes it out of production, it cost so much. If you believe the other manufactures are just sitting around waiting to see what happens you are kidding...
Construction delays at the plant are going to happen. However all of that should have been considered. Engineering delays, to some degree, are going to happen also, but not years worth. If the problem is with the extender then it wasn't vetted properly in the beginning. Things in the world...