Why Does India Have So Many Writing Systems?

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India has a lot of languages, and a lot of these languages seem to have their own writing systems. So why are there so many languages in India and Southeast Asia, as compared to somewhere like Europe or China?

MUSIC:
"Monsoon Rain" by Kikoru*
"Every Color in the World" by Taomito*
"Lost and Forgotten" by Jon Sumner*
"A King's Ransom" by Bonnie Grace*
"Bollywood Star" by Jhukane Bada*
"Working It" by Jingle Punks
(*via EpidemicSound)