I do think both that there are a lot of folks who are both cyclists and backpackers/etc, and that there is and should be much gear and technique overlap between touring and backpacking. I can say that both are big for me, and for many people I know. I've also gotten an off-the-cuff impression that a fair number of the excellent contributors here are cyclists.
"Bikepacking" (backcountry technical singletrack touring, for example) has had a lot of innovation in recent years (see Carnival and Epic bags), and the line between ultralight backpacking and bike touring has some fuzziness. I've had some parallel development of the two in my life, and am working with some gear ideas to flow in multiple directions.
I think the idea that "you can't have a wilderness experience on a bicycle" is worth considering, although I also wonder how much of one you can have if, say, you're constantly touching plastic.
BPL is an awesome resource, and I appreciate its focus on wilderness, simplicity, and common sense, among other things. I don't think that a bike touring forum would detract from that core, but would (hopefully/likely/if done right) just widen our array of quality people and content around here. More collaboration and diversity!
Sorry I'm so wordy... (if you even read this far :] ) G'night.