Preface: I'm a video editor.
Ethernet is not legacy. Some of us "pros" actually need our macbook pros to have the necessary ports so we can do our jobs. If Apple doesn't update the Mac Pros then I'm jumping ship to a Windows based tower based on the new thunderbolt Asus boards. Apple's adoption of FCPX has made this decision substantially easier.
And no... twin thunderbolt ports are not great if they're occupied by previously unneccessary adapters.
Sound like you are switching. Good luck with that.