Wulf Ratbane said:
There is a reason that we did not see endless splatbooks full of new Deities, piecing together the Domains in endless combinations: because the underlying design was already very nearly 100% efficient, and so there was nothing to be added by additional "fluff" design-- the players would have seen right through that.
The very fact that a Book of Traditions and Implements is even possible indicates that the design is either not analogous, or not as efficient. The core rules should have an efficiency that leaves nothing to further design like that.
Wulf, you know that I really respect you, so I hope you'll take this in the spirit it's offered.
I think you're looking for the worst-case scenario here, and then assuming that's the way it's going to go.
Yes, it's true there weren't endless splatbooks of nothing but deities and domains.
But, there
were plenty of new deities, and new domains, sprinkled
throughout the books. So while the design of new deities and domains on one's own was easy, clearly there was also still room--and even demand--for the designers to do some of that work themselves.
Why, then, assume that the new implements and traditions to which Dave refers are going to occupy a book of their own? Honestly, I'd be
stunned were that the case. I expect to see them treated much like feats and PrCs were: That is, in any book where it's appropriate, you'll probably find a handful of them.
Just like gods, or domains, or PrCs, or feats, or damn near everything else in 3E. In 3E, it
would have been possible to fill a book with just new deities and domains. (In the "brief write-up sense, not the
Deities and Demigods sense.) Just as it's almost certainly going to be
possible to fill a book with implements and traditions. The fact that it's possible doesn't make the original basis poor design, nor does it mean WotC's actually going to do it. I think the latter is just as likely in 4E as the former was in 3E.
Honestly? I think most of the concern some people are expressing over this are definitely making mountains out of teacups, or tempests in molehills, or however one wants to phrase it.

Much ado about, if not nothing, than very little.