CalDAV not catching the wave?

CalDAV co-author Lisa Dusseault blogs:

"Were I to propose CalDAV today it would probably be CalAtom -- some things would be easier, some harder, but it would catch a wave instead of drifting in the tail of something that was never much of a popular wave. Oh well, we needed something then, and WebDAV gave the most leverage at the time."

I guess it remains to be seen if the CalDAV wave is large enough, if even the co-creator of it can disparage it so. There are certainly a lot of people still laboring mightily on implementing CalDAV in real products and services.