At end of 35th game(beyond half way). Here is success gfx of team’s history in IPL. This year the red bar(2nd phase) of each team is less crowded suggesting gap between top and bottom teams. Teams like Delhi, Mumbai & Bangalore are not winning hence the gap. Am assuming at end and beginning of last phase, these teams will win consecutive matches making tournament more interesting, and making blue bar of each team long and crowded!.
On other hand….if these teams don’t start winning than top 4 will have the longest duel in IPL history, making the blue bar the lengthiest!.