Yes. He's unsuited for the Speaker's job, or rather the Speaker's job doesn't suit his strengths, but he needs to be in leadership somewhere because of the good work he proved he could do up to 1994.
If he couldn't handle it before, why do you think he could handle it now?
He should never again allow himself to be put in a position where he can be personally charmed and manipulated the way he was by Clinton. Think about it. Why did Clinton want to meet with Dole and Gingrich? To screw them. Why did they agree to meet him? Because Slick was the President of the United States, and they couldn't very well say no, although they should have. Gingrich should never again allow himself to be put in that position, of negotiating with screwover experts like Bill Clinton. But that doesn't mean he shouldn't ever be in leadership of the congressional GOP. He has many abilities, just not that one.
He resigned from the Speakership and basically walked out on his House seat.
He resigned from the Speakership because (correctly) he had concluded he was no longer effective, he had lost a lot of traction with the House Republicans he was supposed to lead, and the MSM were closing in on him with "ethics" issues. They were trying to hang him, and they were doing a good job of personal destruction.
He could have remained in his seat, but he'd have just been taking up space (I gather he concluded) and, as he said at the time, needed to go off somewhere and retool and recharge, away from the MSM's constant demands that he square accounts with the rest of humanity by committing suicide.