I think Jackson has a much bigger upside than Johnson. For starters, Jackson can talk. I don't know if he can cut promos, but he can speak the English language, which is a good deal better than Johnson. Also, Johnson was an awful wrestler. Jackson isn't bad, but he's just bland.
WWE thought they could "push" him by putting him over a stable (Corre) nobody gave a flying

about. So he's in a spot he's not ready for, largely due to WWE's poor assessment of how over their talent is.
I like Jackson, I want to see him succeed (and have said many many times his legal name is far more badass than his WWE copywritten name). Maybe this goes back to our discussion about WWE using "gimmicks." What is Jackson's? He's a guy who wrestles. Might as well be Gunner Scott.
Jackson has held a number of prominent titles in his WWE time, but he's totally, totally, totally forgettable. And I put some responsibility on WWE for that.
...and much on him for that. He's done nothing to connect with the crowd. He's like "hey, everyone, I'm huge and bald and black. that's enough, right?" His theme music is WWE CAW default theme #6. Might as well be Hardcore Holly's song with something about domination in place of "HOW DA YAH LIKE ME NOW?" His personality is nonexistent and I'm not impressed enough in his wrestling to buy a ticket to see him.
On the other hand, someone who has charisma and really impresses me in the ring is Heath Slater. He needs a haircut and he needs to return the tights he borrowed from Alex Shelley, but he's got that "it." I think he needs a mouthpiece, too. Someone like Jimmy Hart to talk about how Slater's narcissism, skill, speed, etc. I cringe when I hear his "one man rock band" schtick. That's

in' backyard wrestlin' right there. Cut his hair short and put him in a tag team with Tyson Kidd. Give them a manager and send them to the tag team titles.
Oh, and repackage Kidd, too. That Hart Foundation lineage shit ain't foolin' anybody. Guy's less over than whoever is shooting the t-shirt gun that night. But Kidd and Slater as two smarmy kids who think they're a million times better than they actually are? Awesome. Like The Rockers, but heel. Bring in Young Bucks to feud with them across the summer. Pay them in sandwiches, it's an upgrade over TNA.
New Nexus has no Punk and no tag titles? Break them up: have McGillicuty take on the name "Hennig" and promote himself as the second coming of Mr. Perfect (sorry, kiddo - trying to make your own mark on the industry just ain't cutting it). David Otunga can work as enhancement talent for a bit (he's already there), and...um, who are the other guys in the Nexus? Mason Ryan?

, he's tall and ripped, I have no worries about how WWE will treat his career trajectory.
Lastly...is that fat Rotundo kid still around? Have him talk to Amish Roadkill about his "Braddock" gimmick in OVW. Dude is a perfect fit for something similar.
Dear WWE: you're welcome. And I don't mean that in a Perry Saturn way.