spine i hope thats /sarcasm right there,
no outside buff in the whole game gives resistance nor defence to psionic damage, i mean sure controllers can get some shitty shield for it, but big deal blasters get stun in their psi primary or whatever you choose for secondary, whether it be sleep from elec or more stun from energy.
And yes psi blasters will be a boatload of impending doom as psi has extra range due to its lower BI, the result of which is who cares because no one resists it outside the 3 powersets mentioned. Hell, a blaster can stun w/e has its mez protection anyway if they choose energy as the secondary.
Now take for example your regular arena team,
2 rads
2 emps
2 sonic
1 kin
1 blaster
The reason this team is good as they can cap all resistance and with 2 emps this team is pretty unkillable in a group. with double fort on the blaster who is now SB'd and attacking a target with 2 rads on its ass and sonic siphoned... anyway im getting off track.
The point is, sonic doesnt do shit about psi resist, defence is shit in pvp so the defence from fort doesnt do crap but do +dmg and +tohit.
anyway, you see where im going with this?