Disillusionment with the ruling Congress is widespread. Its leadership too seems resigned to not regaining power. All it wants to do is thwart Modi from winning.
Jayalalithaa's English is excellent, which should be sufficient to make her PM. She needs to brush up on her Hindi though so that she can endear herself to the 400 million Indians who speak the language. That in itself will provide her more longevity of tenure than anything else.