After years of stockpiling talent and building solid all around teams, the AL has apparently decided to make interleague play more of a fair fight by exporting its top pitchers to the Senior Circuit. Just this year we've seen the following stars switch leagues in exchange for prospects:
Now most of this is probably a result of teams not wanting to trade stars within their division, and increasingly, within their league. The short-term effect of this imbalance would seem to be a positive for teams like the Yankees, but unfortunately it is also a positive for the teams they are fighting in Boston, Tampa, Chicago, and Anaheim.
One could say the biggest effect on the AL's elite is that it could end their All-Star game dominance while giving up the all important home field advantage in the World Series.