This change wiped 2 weeks off the calendar, so players have to adjust their schedule a bit. Some of the 250 events had to change weeks this year and players who played some of them last year chose not to enter this year. Guessing the TDs of those events weren't pleased.
Also, during IW there is a challenger played in the 2nd week in Phoenix that allows high ranked players who lose early at IW to enter(its like the best challenger of the year), so they don't have to just wait till Miami to get more match play. With these new 2 week events, players who lose early in Madrid have no options except to just practice until Rome starts, which can be a very long time if you are a top 32 player who gets a bye in Rome. Guessing many players aren't really crazy this new schedule. Fritz criticized the change, I believe.