That ship sailed long ago. When the MRCA requirement was first floated, Dassault offered to move the mirage production line lock, stock and barrel to India. This was in 2001. The MoD/IAF in all their wisdom, chose to go for a multi vendor selection process, as a consequence of which we still haven't inked the contract. Mirage production line was about to close, and the IAF was told that without firm, committed orders, it would have to be shut down forever. And that is precisely what happened.
If we had simply gone for mirage-2000-5s, we could have absorbed the technology easily, and finished production by now, retired all the mig-21s, and spent quite a lot more money on LCAs and additional MKIs. This would have meant a much more fighting fit IAF from 2008-2020, when 5th gen aircrafts begin to trickle in. We would also have cut down on the cost of new training and maintenance facilities and the time and money to train with a new fighter type. And we could have upgraded the 59 older mirages in house, thereby saving another couple of billion dollars.