There are no more triangular or quadrangle ODI series anymore. We only have ODI now in bilateral and World Cup. The advent of T20 has completely changed the cricket year. Now for two months we have iPL and rest of the year we have WC, bilateral series and rest of the T20 leagues.
Even it's no popular decision, but now ICC need to overhaul their all system and stop this time-wasting ODI and just concentrate on Test Matches and T20 because ODI is lost it's all attraction and peoples have no enough time for watching this all throughout day with this they will be able to work on T20 format and having some good number of new teams as well those wants to play this entertaining format and this can attract some good market in many countries those are not having any cricketing set up.
In test match they also need to work on and try to cut few teams those are not able to have quality set up which can help them for bringing some good test playing guys because it's also very important for better quality and results.