Pretty sure the series isn't over, if for no other reason than there haven't been enough chapters after the end of volume three to complete a new volume. The next edition will feature a colour page, so yeah, there will be a next chapter.
Guess we'll see a new class, with new issues and new worldviews. I'm also guessing that Aizawa won't give up and the series will end for good when Takayanagi allows himself another shot at happiness by her side. Or something like that.