Apple wants developers writing 64 bit Cocoa apps for Lion. Apps that have Full Screen support, Auto-Save and Versions support, and use technologies like OpenCL. These apps showcase OS X and drive sales of hardware.
Rosetta costs money to support, and does not drive sales of new hardware. Apple makes money selling hardware. If someone needs Rosetta, then Snow Leopard will remain viable for several more years.
Rosetta costs money to support, and does not drive sales of new hardware. Apple makes money selling hardware. If someone needs Rosetta, then Snow Leopard will remain viable for several more years.