We are not talking of how many units were sold my friend. We are talking of the design language of tata cars. If the number of tata indica's sold were to be considered then IMO how many of those tata indica's turned into yellow plates should also be considered.
Indian mentality doesn't see the tata cars as a premium brand. This mentality will not change until there is a premium offering by them. By premium offering I literally mean PREMIUM. Not the cars which are released under 5-6 lakhs and don't have an engine guard (atleast) and are called luxury/premium Hatches.
Tata has to get into the luxury/premium league. They did it(tried may be) with the zest. But by then the taxi image with the tata's was already soldered hard into the heads of the general public which just refuses to change. since they have JLR with them, the luxury image can be used to a large extent and release limited edition atleast.