It depends on what sort of users you are targeting and how much resources are avaliable.
As most of your users are highly educated and use English as their native language (by native language, I mean the language they are most comfortable with), then it is important that you focus on providing an English version of your website.
Are you planning to reach audiences/customers who speak Hindi? Are speakers of Hindi a potential customer/audience of what you are trying to say/sell? If so, then yes, you need to maintain a Hindi version of your site.
If you believe that a large portion customers/audiences you are targeting should prefer to use the Hindi version of your website, then you should do some testing to see why the Hindi version is not being utilized. Is it because the buttons/links to change languages are not prominent? Or is it that the Hindi content is not updated in a timely manner?
It all boils down to your customers and audiences. If there is a demand for the Hindi version, and it allows you to reach your target audience and customers and you have the resources, then yes. If you don't have the resources and Hindi is not that important for your existing and potential customers, then provide a Hindi version on a best effort basis.