I feel that there has been too much talk about thums up which is probably not justified.
Thums up is a cola in the end and so much discussions is just not needed.
I also dislike the way coke uses thums up to hit pepsi below the belt and promotes coca-cola at teh expense of thums-up when actually it is a very profitable brand and something which is very popular in India and has a lot of potential.It is something we all drank not so long ago and we have memories of it..
So I feel that as colas are chosen more because of the brand than the taste Thums-up can be the most popular brand provided coke stops milking it.