The article made a lot of good points, but it's not a complete list of reasons for the hatred of Palin. There's the fact that she's a woman, which is a threat to the party that considers itself the standard bearer for women. There's her looks, too, which I think are a threat on so many levels that it would take forever to catalog them all.
She either has a marketing consultant, or is doing a brilliant job on her own. She's become a power broker in the Republican party, and has also managed to make millions for herself in the process.
From what I've heard her say lately, it doesn't seem like she's become a policy wonk by any stretch. That's not necessary if she's not going to run, which is possible, as she's got a good thing going now. Or maybe she's studying away, and will surprise everyone should she decide to run.