This argument about porting Finale or Sibelius is a
bit like
suggesting we put pressure on Photoshop to port to Linux.
Dreamworks did exactly that - asked Adobe to port Photoshop. Adobe
refused, so Dreamworks paid Codeweavers to hack on WINE until it
could run Photoshop. It's a hybrid libre/proprietary solution, but it
worked out a lot better for Dreamworks than having two machines on
each desktop.
Cheers
Daniel