He might be wanting to have a WSB championship before making the jump. This year it could happen, but if not he's very likely to get it next year. MotoGP, OTOH, he knows is still a different game, with a steep learning curve, and that he'll be a little while catching up.That's correct.
Additionally, I think Spies is making a mistake. He should be in MotoGP right now! Definitely by next season. There's no time to wait. Going to GPs as a rookie at age 26 or 27 is too late! One of the satellite Yamaha MotoGP teams wanted Spies next year. That would provide him with the perfect opportunity to jump to Rossi's seat later. Maybe the money wasn't there?
Another possibility is that the "rookie rule" requires a certain number of MotoGP races before moving up, not a "season" specifically. Spies has already done a few as a wildcard with Suzuki, so if they can put him on a bike for nine MotoGP races next season, on the side, no pressure to perform, he qualifies as a "contracted ride" to skip the satellite and go right to the factory team in 2011. Or maybe they are planning to try to get the rookie rule dropped.