Tea seems to lose its flavor when it dries out. Long-term in a dry environment, I would worry about the tea slowly gaining a lifeless stale taste. It doesn't take a lot to maintain humidity though. Some people report good experiences with just mylar bags and boveda packs.
Over a single year or so, I wouldn't worry too much about it.
This is something you'll have to experiment with. Also, once you've "lost the flavor" it can be partially brought back by cranking up the humidity. I don't know what your storage situation is, but a cheap humidity monitor, some plastic bags, and some humidity packs (I like the 62% Integra boost ones) is not a huge investment and will really help your tea age gracefully.