I write in journals as well. I think my pile is at least 1.5 feet high. While they take up space, I would personally feel like I may have just wasted time. It doesn't make much sense, but it is records of thoughts and feelings of a past you. Maybe you can learn from them?
I always thought it would be interesting to pass down journals. But maybe not so much.
Also, incredibly ironically- the day you made this post is the day/day after I decided to do a new journal after months. I couldn't bear to write in my other because I stabbed it and it was just all too negative.