Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
Marriage is not just a social relationship with love between 2 people but it is also a relationship of two families. Islam did not allow parents to force their kids to marry against their will but at the same time did not allow kids to marry on their own without consulting and getting the blessings of parents so all new families will live in peace and support of their parents.
In your case, it is really all in the hands of the man you are interested in. He has to take the initiative and convince his parents. If he feels he cannot go against their will he should be honest with you and come clean and say, I cannot marry you. It is better for you and him so no emotional shock would come to either one of you.
You can wait for a certain period of time that you estimate he has a chance to convince his parents as hoping it might work. But after that time, you need to be clear and real with yourself not to hold on to dreams that might never come true.
If he was meant to be your husband it will happen and if he was not, ask Allah SW to bring you better future with someone else.
Almighty Allah knows best.
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