Yes, the decentralization of Bosnia under Dayton is viable, because the way Dayton was written allows for decentraliztaion. The Dayton Agreement was carefully crafted, but it does allow specific ways for the region to decentralize again. This is not a good idea in actuality. The region is far too unstable to try. But it would be possible under Dayton.
Yes, the decentralization of Bosnia under Dayton is viable, because it has been many years since the Bosnian War, and the region has stabilized a great deal. Bosnia remains quite decentralized as it currently functions, with a presidency that rotates. Although it would be difficult, and might not be a good idea, decentralizing Bosnia under Dayton is viable.