I'm not sure the intended scope of this discussion but it seems clear to me that the publish-immutable model is best, just the view-private mode needs a few more features added. For example, a view page doesn't even say the author's name anywhere. To address Dan's concern you could simply add a button under options, next to "let me hand out view-private links" to also "let anyone look at a list of all my unpublished decks just by knowing my username". After that you could add a feature where published decklists link back to the possibly-updated private version, as long as the author says that's ok (whether with that global option or case-by-case when publishing).
The two main advantages NRDB has over Meteor for me are that suggestions make deckbuilding extremely fast and that meteor's interface is way laggier on firefox. Keep those and you'll keep me.
I have a handful of small unrelated complaints: I want to configure the bbcode export button to not put [color=...] tags, which don't work on stimhack; I want to configure the mouse-over-card-tooltips to show images instead of card text (meteor does this); I want some way to disjoin or negate card search parameters; when you check/uncheck a box in the "which sets enabled" list your scrollbar warps back to the top of the page (at least in firefox); and finally, when you click to highlight a deck in "my decks" it steals the browser focus in some way that I can't ctrl+T, ctrl+W, ctrl+tab, etc until I click off somewhere else on the page.
All in all, the site has a lot more features tucked away in places I didn't even realize until I went scrutinizing to try to remember all the complaints listed above, and is just really mature and well designed overall. Good job dude.