I played on a PvE server for a long time and know that Defilers are a better choice healer for MT group then Mystic. So it is in the best interest of the guild to switch you out. But at the same time you should still be an important aset to the guild, as you would be a better healer for the Mage group or off tank group. I play on Nagafen Qeynos so Im alwayz in the MT group because we cannot have a defiler. But If i was in your place I would just go DPS spec on your mystic. Get all your melee attacks with 5 AA points, get the 100% melee crit and get the chance to double attack. Get yourself a good one handed Melee weopon and you can be in the dps group. I can parse with my mystic about 1k plus in a raid. So you can help out in dps and be a great healer for the dps group. You would still have alot of fun, you dont need to be in the MT group just to be important.