I'll be completely honest here, and not troll this post:
I don't think Bioware will notice, or care, if Sorc/Sages don't Arena. There's a reason I brought up Roguecraft in the Sorc forums, and it pertains to the fact that, by the numbers I've been able to gather, Sorc/Sage is among the lowest-played of all classes, and healers among the bunch are even tinier in proportion.
Hell, we could all QUIT PLAYING the Sorcerer/Sage altogether, and that'd be less than 120k toons total.
Sorcerer/Sages are mushrooms.
Vanguard/PT are other mushrooms.