That favors CL and Poser because people are reluctant to abandon the format they have for another till they have to.

Sort of. But it could also keep us using VHS while they're arguing DVD formats, if you know what I mean. P4 compatible is D|S compatible. You can be compatible with both Poser and D|S - if you sacrifice the more advanced options of both. For that reason, I think Anton may be overly optimistic, thinking P4 support will end with the release of P7.

Somehow, it just doesn't seem like something that ought to worry me greatly.

Well, it doesn't rank up there with, say, peak oil or nuclear war. :-) But surely you can understand why people who have a lot of investment in the outcome - merchants, say, or just customers who have a lot of time invested in learning a program and/or buying content for it - are concerned? And it's more than a format war. If DAZ goes belly-up because they can't make this D|S/Bryce thing work, a lot of us would be affected.