My point is, IPL isn't going to stop everyone playing cricket. Now it's bothering PAK cricket because PAK players are not playing in IPL - if it was open for PAK players, PCB would have been first board before ICC to stop International schedule during IPL and cut a pie from players share. If you don't like my comment, please do ignore - but I have signed PAK players for club cricket for tokens like $500-$1000, and they had to cut some pie .... IPL pays in millions.
Coming to the international schedule, you have to find a way to manage with best 10-12 weeks of cricket season being locked out. There will be countries for whom 1/2, may be 3 players will play IPL - do you think rest players are going to seat out for that? ICC or BCCI can't block bilaterals between 2 boards, and IPL won't bother if their players are released for IPL. In fact, if not released, they won't bother even then - simply tell their player (s) to become free lancer. In an universe with incompetence and corruption, one country runs the entire economy (of cricket) like God, then you can't blame them.
There can be bilaterals during IPL, and domestic tournaments as well - if one can arrange that.