Something's may make you think hrmm... nice change there but overall, it's a nerf due to their refusal to vastly change the class after these stat changes come in.
OK - Look. Have a bit of faith. This will all get playtested on the closed test server (I forget the name) and then on Bullroarer. Should it turn out that Guardians can no longer tank, the devs will fix it.
Your present analysis does display "game breaking" - exactly that. I know the devs have done some stupid stuff, but they aren't *that* stupid.
Going offline for a bit to deal with the real world just incase anyone wonders why I'm not playing the new SWTOR expansion tomorrow.
So please no story spoilers until I get a chance to play.