On one side Reliance' entry is beneficial to customers, Jio which made high speed data cheaper and accessible, Retail stores which are convenient to consumers and Jio cinema that arranged free WC viewing experience etc.
But on the other side it destroys many. Telecom sector shrink to 4 players from nearly 10. Only Airtel is giving any competition for them. Apart from strong money-back Reliance is getting favour from the Government. So the rivals are like tied their body partially when competing with Reliance. This may lead our veteran and big players to turn face against India in future. That table may have Amazon, Disney etc. And we can't predict what happens once Reliance establishes their monopoly in desired markets.