I don't know a lot of about fusion, but I've read Helium is a byproduct of fusion reactions. Once these things start getting run more and more, will we be able to harvest the helium generated to stave off the coming shortages?
Yes, you have a cursory understanding.
What people don't understand is that continuing this fusion for power kick will drastically alter ambient helium levels, and with that, the pitch of our voices! To answer your question, not only will shortages be reversed, but exponentially so, and to the detriment of our manliness.