This is convoluted logic. It is the quota for Anglo-Indians that needs to be abandoned, instead, because in a country of so many tiny communities, there is no reason why only they should be so favoured.
The case for according NRIs such a privilege is flimsier still. Most decided to leave India because they saw better prospects overseas. They earned a lot of money, a portion of which might have come back to India. But apart from that, it’s not clear what their ‘contribution’ to the country is. Also, if NRIs are so keen on gaining membership of Parliament, they are welcome to return and fight elections like everyone else.