Frankly, I agree with you. It's way too early to speculate about or name a frontrunner for '08. Too much can happen over the next 3 or so when things get serious. I consider this article a quick fix for us political junkies.
Doesn't surprise me, since my internal BS meter increasingly wonders if the whole recall thingy was a setup for Arnold to become governor without having to run in a Republican primary. If he runs for reelection in '06, he's not likely to have a significant primary challenge. So that wouldn't be an accurate test of his willingness to face the Republican grassroots on fair and open terms.
At this point, all I can say is thank goodness the President has set an extremely ambitious agenda for his new term, because it will keep everyone in DC too busy to take on a constitutional amendment fight.