See, I live in a place where indeed TaB and Fresca have never gone away. They are the items in store refreshment fridges that are always stocked on the bottom shelf, out of the place where glancing, unseeking eyes might search for them, but they are always there.
The sodas I miss are Tahiti Treat, Crystal Pepsi, and PC Chocolate Soda.
Tahiti Treat used to be a drink labelled as such when I was younger, then it was taken off the market. Crush came out with some limited edition flavour favorites a few summers ago and one of them was Crush:Tahiti Treat, and it was almost exactly the same as the original, and I was all over it. But it was a limited time thing, and now it's gone. I loved Crystal Pepsi. Loved it. I imagine I would still like it, but I'm pretty sure that my love of PC Chocolate Soda was a childhood thing, and if they made it again I would totally hate it. The Chocolate Soda had an illustrated picture of a chocolate bar on the can, and it looked just like cola, to the point where the chocolate taste was always a surprise to me, even though I new it said "Chocolate" on the can.