Agree, even the people who don't need 64-bit addressing would want to have the extra speed that comes from x64 mode.
The x64 chips have native 32-bit mode - even native 16-bit mode!
Applications can be a mix of 32-bit and 64-bit applications - when a task is scheduled the core is put into the correct mode for that task.
Windows x64 Edition shows which processes are 32-bit jobs running in WOW64 by putting a "*32" by the name.