The three language education policy even if not enforcing Hindi, will end up enabling and propagating only Hindi! Since I'm from Tamilnadu, I'll restrict my views to it; but you can pick this template and apply to any state/UT of India. Students cannot learn on their own, this would mean hiring new teachers. But Schools cannot afford to hire many teachers due to budget, that cascades to lean number of choices available for student. German/French/Japan or any such international language teachers will be highly sought after by lavish private schools which translates to high salary for them, naturally schools catering to middle class will not be able to afford them. Thus school administration will end up hiring Hindi teachers readily available from Dhakshina Bharat Hindi Prachar Sabha. Maybe some schools present in borders towns like Vellor, Hosur, Nagapattinam will choose Telugu, Kannadam, Malayalam and so on. Baring them I can only see Hindi flourishing in future. I'
free from spelling and grammatical check, just keepin it human