The next general election is not a done deal. Not yet. Unless the Opposition surrenders to this psychological warfare and gives a walkover before the match begins
Mature nations do not react when provoked, they respond when they choose to. He may not deserve it or even acknowledge it, but this is the time to help the PM retrieve the situation.
The Congress is an obstacle to those who want to build an alternative. A large mainstream party acts like a magnet that catches a lot of energy around it. So, even when the Congress is unable to defeat the BJP, it ends up diverting and diffusing a lot of the energy that gets drawn to it.
This agitation is not against English but against the dominance of English. It is against the presumption that the national talent resides within the tiny pool of English speakers.