Some of my opinions
1 - Get rid of D/L method. If it rains, play the next day. This is ridiculous
2 - Only teams who have test status should automatically qualify for the world cup and non test status team will have to play a small pre-qualification tournament to decide who goes to the world cup. Only 2 or 4 teams should be allowed.
3 - T20 should be held every year as a fun way of kick starting the cricket season but the ridicilous spin off tie break should be get rid off. It should be held in countries where ICC is trying to expand cricket like Canada, Netherlands, Ireland, etc…
If there is a tie, both teams should play an extra 5 overs. If it ties again, both teams should again play another 5 overs, etc…