If one demands this there will be no students. If there are no students then the entire art form will die within one generation. Of what use is tabla if it exists only in the history books. It is no surprise that musicians in India have changed their approach over the last hundred years in order to accommodate the modern world. I think that the basic difference between India and the US may be seen in the different attitudes that the musicians have toward this process of accommodation.
Indian teachers have a tendency to deny that they are making accommodations.
There is a general presumption that whatever is old is automatically best. Therefore the average music teacher will go through the motions of maintaining the tradition. For instance there is the system of certification. Throughout India music students go to the local colleges to be examined and awarded diplomas and certificates. There is nothing wrong with making changes in the pedagogic process.