Adobe isn't splitting Lightroom into two versions; both perpetual and CC users will get Lr5. The difference is in when the free updates are released and what's inside them. Perpetual licensees get bugfixes and compatibility patches. CC subscribers may also get new features. Nobody's guaranteeing they will, just that it's legally possible.
I know this appears to contradict Adobe's argument for moving to CC, but Lightroom is part of the Consumer business along with the Elements line (the full-fat version of Photoshop and co. are in the Creative business unit, who are the ones implementing the CC system). We're not talking about running two different versions (Lr5 and Lr6), but scheduling the release of dot upgrades differently. As existing users of Creative Cloud know, Adobe have already pushed some exclusive new features to them for Dreamweaver, Illustrator, etc; but they're still called CS6. Lr will continue to have major release cycles when the version number increases, we're only talking about what happens in between those times. I'm sure Adobe would like to offer new features to perpetual license holders as well, but the lawyers say no.
The primary sales route for all consumer products is via retail (perpetual licenses and what used to be boxed products), so the fact Lr is also in the CC bundle is more of a side-effect; the same is true of Acrobat. Development will carry on as normal, there are no plans for "Lightroom CC" or "Acrobat CC", neither will Photoshop Elements go subscription-only.
In future there may well be times when new features appear in the CC-bundled version of Lr which aren't yet in the perpetual version, because Cloud subscribers get new features quicker (as SOX doesn't apply).
So how is that you say you can't continue CC and perpetual versions of programs because the code maintenance is too tricky but now you are actually splitting LR into CC and perpetual?
I'm an amateur photographer who uses Lightroom (4.4) and Photoshop (CS5 Extended.) I haven't updated my version of Photoshop because I use the program a couple times a month, for HDR and layers adjustments. I use Lightroom regularly, but there are many things Lightroom can't do that my version of Photoshop can. Based on the pricing, I guess Adobe just doesn't care about users like me.
I'm no expert on Photoshop, but have invested 20 hours or so in Linda.com training. I have purchased Photomatix for HDR, but will need to find another solution for things like layer/mask work, content aware adjustments, etc. I have no interest in the other applications Adobe wants to offer me as part of the subscription.
I'm sorry I wasted the time over the past couple years learning how to use Photoshop.