LP's won't operate these trains. They are fully computer-controlled (using advanced signalling systems from Nippon) and don't need any human supervision.
The Delhi Metro's system is of the highest 'Grade of Automation'( GoA of 4), which means that the trains are capable of complete automation (moving between stations, announcements inside the train, opening and closing of doors etc). Such systems are capable of operating without any drivers.
That said, I think it is sort of an overkill to have an exhaustive automation like this in India, where there is a considerable workforce...
more... available. Particularly, a metro is a very specialized railway line. So, driver performance is not really a limiting factor in the efficiency, or train frequency. I would see this as mainly a cost-cutting effort.
While cost-cutting is definitely something that should be given importance, I think it is possible to find a middle ground here (going for a lower grade of automation, like most other countries).