Actually, since the main airframe parts of MK1 and MK2 will remain the same, MK2 will benefit from the MK1 productionline, since it won't start from the begining again, but can keep producing most parts away. However, the more we change with MK2, the more delays can come in other fields. For example the engine is new and we have to see how fast the licence production of it will go on, similarly, the cockpit will be re-designed (most likely a waste of time), which again needs new external productionlines, not to forget that we still don't know the truth about either DRDOs MMR or the AESA development and it will be interesting to see, if they can keep up with HALs productionline.