Hmm, if all iPods go touchscreen, what's the point of putting touch in the name? Before the iPod touch was announced, the iPod classic was just the iPod, remember?
So, if Apple does as you say, seems more likely they'll just drop touch from the iPod touch, making it the new iPod and leave the iPod nano's name alone while transforming it into a small version of the full-size iPod. That'll leave us with the iPod shuffle, iPod nano, iPod, and iPhone. Very simple.
I can see that happening only if they drop the iPod classic, which I'm not sure they're going to do just yet. Now if they can get a 64GB iPod touch out the door for a reasonable price, then most people would be ok with that because in less than a year, a 128GB iPod touch is almost a given. That's more than enough space for most people.
I think we're just as likely to see an iPod transition like that as we are a MacBook and MacBook Pro transition that involves dropping disc drives and slimming them down to match the Air's style. Maybe they'll completely kill replaceable batteries - MBs and MBPs are the only things Apple ships with such batteries. Not sure if SSDs are cheap enough, but they'll likely be optional.
AppleTV might get a minor improvement through Netflix. Obviously Netflix is transitioning from a DVD rental service that's having trouble keeping its head above water to a digital movie service that different devices can essentially tap into. The 360 will be getting an update this fall that allows for the streaming of Netflix Instant movies from a subscriber's Instant Queue online. I'm guessing Apple would like to make that service better by downloading the movies, rather than streaming them off the internet, and enabling the browsing of Netflix's entire digital library from the couch, rather than requiring configuration through Netflix's website.
Whatever Apple's up to, we'll find out ridiculously soon.