Well your idea of a lot of money and Apple's are quite different. With less than 5% of sales going to ipods it looks like the Touch is becoming a legacy device that Apple holds on to just for old times sake like the ipod Classic. Also as they sell more phones each year there is some continuing market cannibalization by adults just giving old iPhones to their kids rather than buying them new Touches. Don't get me wrong I do want to see a new one and would buy it but it's future is limited. When they brought out no new model last year I went and bought a refurbed 3rd Gen as my new Touch since I needed the 64GB storage. Unless they bring out a new model I won't have any reason to buy another one again. I'd be more likely to get a used iPhone cheap and keep it off network.
I see tons of iPod Touches around. They are far from dead. They won't get the same attention the iPhone will, but they will stay around.