I'm not so sure the level of play is quite that dramatic of a fall off. The Russian, Finland and Swedes might be able to "embarass" these teams, and possibly a well stocked AHL team, but I doubt it would be quite that one-sided, and I think you might see an upset or two.
For me, that would be the interest in this kind of tournament. You hear alot of talk about relative skill level between the leagues under the NHL... well this would be one of the only times you could put these guy's against each other in games that really "matter".
games I would be *very* curious to see
NCAA vs Canadian Junior
AHL vs ECHL
AHL vs Russia, Finland, Sweden, etc... (Where do the Calder Cup champions rank?)
Russia vs ther Euro leagues (Is Russia really #2 behind the NHL when the ante is as big as the stanley Cup?)
It wouldn't give a "difinitive" answer, but it would be great fodder for a hockey debate... what more can you ask for from a tournament?