[gammaray9]

It is as practical a matter as the adoption of Indian numerals by Europe in the 1200s in favor of Roman numerals.

English happens to be an Indo-European language and does not seem as 'foreign' to Indians as Indian numerals might have appeared to Europeans.

As an aside, English has recognizable weaknesses as a medium of expression to Indian minds, and if a replacement will be found, chances are it will be synthesized in India.