Bhai I am sure you have been to Mumbai. Have you come across ONE person who cannot or will not speak Hindi there? So where is the issue of not being able to converse with his constituents?
In the off chance that he does come across ONE such constituent who does not understand Hindi, I am sure he would have the services of a translator at hand for such a contingency.
I am a doctor. Studied in a National medical college ..... where we get patients from all over. But being a military hospital, some specialties we would need to visit the OPDs of the regional medical college (BJMC) in our city. For the hardcore marathi speaking patients from the interior areas, we would have translators (nurses, ward boys).
Not ideal ..... but a far sight easier than having to learn the language. Life is too short my friend, and there is a lot to be done. Kaam karo, paisa banao, ghar sambhalo, ya nayi zabaan seekho?
If I wanted to be a polyglot on the other hand, and made my living thence, things might have been different.
That said, do you honestly believe your own argument of his constituents not being able to communicate with him, or is it just an intellectual exercise to provide a palusible rebuttal?!
Cheers, Doc