As it stands right now, we have a few options that I can see (in no particular order):
Jeff Hardy - I think he should be pushed to main event status, though. He's been very impressive lately, obviously over, and he's the right age to lock him into that title picture. HBK, HHH, Undertaker...they're getting old, sadly, and won't be able to do this too much longer. Hardy may be able to be one of the top men in a year or so, so get him out of the IC championship and start working on a push.
Mr. Kennedy - Another guy who, soon enough, will be WWE championship material. I think a good run as IC champ can really help Kennedy and the Intercontinental scene as he's definitely a crowd bringer. He's a little sloppy in the ring, but the guy's phenomenal on the mic, so a little bit more practice and he'll be gearing up for the top title in no time.
Lashley - I'm not as impressed with him as the WWE seems to be. Frankly, I don't think he deserves to be pushed to the top just yet. The ECW title is about as solid in status as the United States or IC right now, so keep him in this area, possibly as the main feud for Kennedy. Let Lashley develop his mic skills a little and work a little more on his character and he'll do fine in the future.
Cody Rhodes - Much too green for it right now, but he's improving. I wouldn't place the belt on him in 2008 unless something weird happens, but I could definitely see him getting a tag team title or something. Cody's young, but he's got potential, and overall the crowd seems to like him enough to root for the kid.
Shelton Benjamin - Very entertaining but my god man, work on a persona a little bit will you? If I want to see a good match, Benjamin can deliver, but if I want to see a good FEUD, you can't count on this guy at all. He needs to work on getting some mic skills and giving himself something of an attribute more than just the commentators saying he's "arguably the best pure athlete in the WWE...for the past three years..." He and Haas could be a good tag team if they had the microphone down, but Haas is holding him back a little I think.
Carlito - That is, of course, if he is even still here by next week lol. Colon needs an attitude readjustment and he'll do much better, but right now he isn't giving us much in the ring so nobody cares about him. He's certainly not ready for the big push but fits very well in the midcard status.
Lance Cade - Another case of the tag team division holding someone back. He and Murdoch aren't a draw in terms of tag teams, but Cade seems to be gifted and he seems really smooth when he works on the mic as well. He needs to separate himself so people will notice as opposed to sharing the "spotlight" with Murdoch, who is average at best.
Santino Marella - If the guy can pick up some wrestling moves and get comfortable in the ring, he'll have a bright future, cause he's one of their best heels right now. He's ridiculous, but we love it. While he won't be a credible IC champ, and he'd be much better suited as the voice of a tag team between himself and someone who is "the strong, silent type", he'd probably be best to feud with Cody.
Now, that's the Raw roster, but as we all know, people can jump brands without being involved in the draft, so there are other people as well who may find themselves on this particular shelf in the near future, for instance, possibly Elijah Burke.