If English is phased out as an official language then kiss all the outsourcing work good bye. Hard to have call centers in India if the person is talking Sanskrit instead of English, hee hee. This is like Egypt calling for a revivial of hieroglyphs. Sanskirt like Egyptian hieroglyphs was the language of a tiny elite.
I doubt English would be removed as its the only way for indo-European and Dravidian speakers to communicate. What could be proposed is for Hindi to be downgraded from official to natinonal. India has two official languages: English and Hindi and 25 national languages (with more than 10 million speakers