Here is a much better answer to the question:
Quote:
http://buddhism.kalachakranet.org/india.html
Following this last flowering of Buddhist thought in India, Buddhism began to decline. It became increasingly a tradition of elite scholar-monks who studied in great monastic universities like Nalanda and Vikramashila in Northern India. Buddhism failed to adapt to changing social and political circumstances, and apparently lacked a wide base of support.
When a series of invasions by Turkish Muslims descended on India in the ninth through twelfth centuries, after the invaders had sacked the great north Indian monastic universities and killed many prominent monks, Buddhism was dealt a death blow from which it never recovered. In 1193 the Moslems attacked and conquered Magadha, the heartland of Buddhism in India, and with the destruction of the Buddhist Monasteries, like Nalanda (1200) in that area Buddhism was wiped out.
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