The smarter path is improving the placeholder editor and *maybe* doing templates there for loops and calls sectioned by CMS in some drop-down. Currently you can z-index and disable clipping and easily integrate anything. I've done it for WP many times.
Another thing you'll likely never see done is widget creation..exporting self-contained markup for embedding.
I can make a list of things that just make sense for DP and WD but I've been using xara stuff for years and have watched their development and responsiveness and don't see any of them happening even in the near future.
EDIT: As has been mentioned here before xara sites use a lot of javascript fixups and windows only fonts, if you're in it for the SEO remember that. They also don't comply with any form of coding standards required for CMS vendor publishing.
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