I have like, 7 or 8 stories on the backburner that I occasionally go "but what if I found time to make it??" and then realize that, no, I still don't have the time or the energy...
...As far as ones I definitely know I won't make, I want to write a whole YA and adult follow-up to my middle-grade comic project (so, like if the 10-year-old girl in my current story grows up). It would follow her through her last year of high school, then drop her off in college, and pick her up again 1 year after graduation while she's working towards building a career. It would be like the LONGEST SLOW BURN ROMANCE EVER because she'd reconnect with a friend/former teammate she has a very uhhh turbulent relationship with. For professional reasons they can't exactly hitch up (she's working in a very male-dominated field and if she gets together with this guy, all of her accomplishments will forever be attributed to dating him). So then they put all their ~unrequited passion~ into accomplishing GREAT SUCCESS TOGETHER, YAY. And they try to date other people and of course it always falls apart. And then, when they win it all on the grand stage, they finally both decide they're being dumb and actually get together. The END.
I really want to write it because I feel like there isn't really a lot of stories that focus on how two people can compete and challenge each other and still be great partners, it's usually one supporting the other, or if they do start as competitors, one of them usually chills out for the benefit of the other (and until recently, it was always the woman).
But between my webcomic project, my project I'm trying to get trad published, and a couple of over novels... I just don't have the desire to write it. And research it, too. I wouldn't be happy with it unless I felt confident in its authenticity, and that's a whole lot of research I just don't want to do. I have comparable experience, but it's not 1-to-1.
Still though... I enjoy sketching it sometimes and pretending I do have time for it.