Thanks for the aid all.
I like the suggestion of using SR/PR creatures. The other spellcasters don't rely on their spells to be offensive (they're summoners and buffers and controlers, rather than blasters), so it wouldn't "hurt" them, it would just challenge the blaster.
By the way (since everyone kept mentioning it

) I had read the rules and understand the details, I just hadn't
considered the rules in play

... I didn't realize how it would interact with the rest of the party.
And, As this was our first session with the character, and this was the first bump
I had run into, I got really worried. So I figured I must've missed something.
I'm still not sure about this wilder class's surge ability.
It's allowing him to freely cast spells that are effectively levels above his character and thus skewing the EL of the encounter, IMO -- sure there's the danger of the enervation, but it doesn't offset when the risk is so low... I just hadn't considered that when I okayed it. It seemed reasonable at the time, but when I saw opponents that should've lasted a few rounds get reduced to ash in one, the challenge just wasn't there -- (I guess you could argue though, that with the power points gone, resources were spent, so the challenge
was there... it just wasn't a party challenge).
I'm thinking of requiring arcane spellfailure for the psionics. I know this is House Rule territory, but the class is effectively a sorcerer (with lots more bonuses -- picking the energy on the fly is HUGE) so I don't think it's too far off as a requirement.