Hes only 21 bear in mind, youre talking as if his career is over and he has no hope of being selected again! Hes a very talented cricketer as the Sussex faithful will back me up im sure, i think he took 37 wickets in 6 fc games this year so hes obviously doing something right. Much like Rashid its about homing his skills consistently. He isnt a 'spent force' yet, we can only pass those judgements at the end of his career.
No offence, but English County cricketers are hardly world class players of leg spin. I mean Kaneria plays for Essex every year and gets truck loads of wickets, and he's an average International cricketer.
In India, an International career starts earlier than in England, Chawla debuted as a 17 year old, England wouldn't dare debut someone that young. Therefore Chawla's confidence has already been damaged. Also he isn't a big threat in domestic cricket in India, he often goes wicket less on spinning tracks. And it nearly all ways out bowled by Mishra, who plays for a weaker side.
Time is running out for Chawla already, there is an 16 year old left spinner coming through and he's being raved as the new Bishen Bedi(India has been searching for a world class left arm spinner since Bedi went in the 1980's!!!)