First of all Chomsky is still alive, and secondly, I'm almost certain that he won't be remembered for his poltical writings, but for his scientific contributions.
People don't even read his very early political works much anymore. His new material is what gets most consumed and keeps his name in people's minds.
Chomsky's writings are still standard reading for people in various activist communities. He will most likely be remembered for both, and for the fact that he contributed both.
I just went to a free Chomsky lecture last week and of the dozens of people I've talked to who also went, all went for the political works, even the linguists.
People don't even read his very early political works much anymore. His new material is what gets most consumed and keeps his name in people's minds.