Success of one such league doesn't insecure another. Every one has their own window. It will only benefit the players and benefit all the leagues. It's wrong thinking that a successful BPL threatens IPL or vise versa.
[Post CWC15 Consistency Record: Test: W-0 L-1 D-2 // ODI: W-5 L-1 // T20: W-1 L-0]