Rhapsody for Intel was dropped because of a lack of software from developers (and in the end Rhapsody for PPC fell to the same problem). Even though many of the early developers were coming from working with OPENSTEP on Intel hardware, by the time DR2 was released most of them has stopped making Intel version of their apps (strangly this also happened with Yellow Box for Windows). Apple decided in the end to release Rhapsody with a suite of server apps attached and call it Mac OS X Server, and then went back to work to produce Carbon to try and please the long time developers. A Mac OS X for Intel today wouldn't have "Classic" (Rhapsody for Intel didn't have Blue Box), and wouldn't have the Carbon support for most ported apps (unless they were maybe created in Project Builder). That would leave primarily Cocoa apps, which is not enough to over come the Applications Barrier (the same barrier that ended Rhapsody).
I still run Yellow Box in NT 4, but it is mainly for effect.