This is how I see it,
AROS/OS4/MorphOS takes Amiga OS to modern computing while caring for that even
old native software works. Programs from Linux are ported at the rate they can be done but the rate will be veeery slooow due to the small amount of devs.
CUSA's goes the opposite route take modern computing and adopt Amiga User interface to it and while it will without no doubt take a very long time to get that right too and to have that solution to run Amiga software in emulation (I expect) you will always have the possibilty to run your everyday open source software on the same machine too without having to have two reboot to the other OS installed.
When all these OSes above have evolved they will actually be quite alike all four of them.
And most users will run the old stuff in some form of emulation be it UAE or JIT but the productivity (serious) stuff will come from the Linux world.
That's why I can accept all solutions above, they are all heading the same direction.
