Stupid decision. Has Bengali been spoken the same way for 1000 year? No. Languages should change with changing times. Most importantly it is impossible for the court to do anything. Like it or not English is the medium of business and if you do not know English you are not going to succeed in corporate world. Frequent use of English is going to result in Banglish. Only solution to stop this is to change Bangladesh to North Korea
Btw these kind of language saving techniques have been tried in the past in Tamil Nadu. They even conducted a world Tamil conference
Tanglish has however entered mainstream and it is very hard to find anyone including uneducated people not using it.