FWIW, I don't think this points to reboots or republications. It's just that, for once, WotC is doing the smart thing, and plugging products they are actually selling to people via DTRPG. If there's ever a return, of any setting except FR, at any point, then I expect full reboots based on the earliest publications for the respective settings. (As in, the products that were best known and most widely distributed. To give you an example, as charming as Krynn looked at the end of the "Rise of Solamnia" series, who of those that bought the old "Tales of the Lance" box really read that one?)
Realistically, I expect adventure-related promotion of old settings, similar to what Wizbro is already doing with Greyhawk and "Princes of the Apocalypse". Or, a high degree of "modularity", as Skyrock says.
Now, that we will eventually see RL return for 5e is a no-brainer, I think. I6 and I10 are too widely known, still, and too widely regarded as classics. - Now, I personally would welcome, without any vitriol, that the next book they release had all the chapters named in the book's index.
