I doubt WOTC is not at least thinking about it. Somewhere, there is a design group at least comming up with things they would like to redo. Andy Collins did that for 3.5, and frankly we know that Andy made some comments considering a complete overhaul of how meta magic works, for 3.5.
Someone is thinking about it, it would be irresponsible if they werent.
While I am sure that Eberron is going to get a lot of support, I just do not believe that all or R&D is working solely on Eberron. WOTC buisness strategy has been to not concentrate to much focus on any one setting, so the failure of any line (like Eberron), wont bring the whole brand with it. R&D is most likely working on something else as well. While 4ed might not be it, the thought has to be there somewhere, especially with the "Re-release" model WOTC has used for it's books,(ie PHB->PHB 3/0/3.5, Fiend Folio, Draconomicon, etc).
Someone is thinking about it, it would be irresponsible if they werent.
While I am sure that Eberron is going to get a lot of support, I just do not believe that all or R&D is working solely on Eberron. WOTC buisness strategy has been to not concentrate to much focus on any one setting, so the failure of any line (like Eberron), wont bring the whole brand with it. R&D is most likely working on something else as well. While 4ed might not be it, the thought has to be there somewhere, especially with the "Re-release" model WOTC has used for it's books,(ie PHB->PHB 3/0/3.5, Fiend Folio, Draconomicon, etc).