If you're doing anything that touches web, I'd say it can be worthwhile to toy around with while watching TV or whatnot. Don't burn high-value time on it, for sure, but if you can spend low-value time it may be a good idea.
This runs counter to typical tips you see when writing your resume. Maybe if you're a designer you want a hosted resume. The reasons given aren't convincing anyway.
Having a resume on a single, unified URL is just as easy to forget to update as having a resume in another format (a possible exception being resumes generated from your github profile). Arguing against pdfs because they're outmoded is just nitpicking. Editing pdf files doesn't have to be a painful experience if you maintain a .doc(x) file that you export as a pdf. And really, how does a DIY HTML resume show potential employers you love what you do more than a DIY pdf resume that is also well-formatted?
This is a strange article for A List Apart. It seems that Andrew Hoffman was grasping at straws trying to think of something to write before his deadline came up.