If you still really like it, you should keep it, even if you don't play it very often. If, however, you don't like it that much, I doubt you'll miss it, so you may as well sell it.
My first instrument was an Ibanez Studio guitar I received for my birthday in 1981. I liked it at first, but that changed immediately when I tried other guitars, especially Strats. I realized I would prefer just about any other decent guitar. But I kept it around because: (1) it was my first instrument; and (2) I had become a bass player, so guitar didn't matter as much. However, once I got back into guitar for home recording and arranging, I bought a Strat and decided to dump the old Ibby.
It took a long time, but I managed to use it as credit toward a sweet G&L SB-2 at a guitar show in 2007. And I have NEVER missed it. In fact, it was a relief to get rid of an instrument I didn't like, especially when it helped land me such an incredible bass.
P.S. My first bass was also a T-40, which was stolen in 1986. I bet I'd still have it otherwise.