IndianMascot Bro.
Why would ICC bear?
Every Board including ICC shares the additional cost of technique used in the Tournament. Technology like DRS and now UHD. Today every Sports Broadcaster own the basic technology of Speedometer, Hawk eye and HD Camera. Its depends on how a particular board wants the match to be telecast. BCCI always quarrel to have DRS system because then they needs start investing on the techniques like Hot Spot, Sneechometer, Ball tracker and all that. Since STAR SPORTS don't own this things as they hardly produces any Cricket matches they appoint all this in a lease. If ICC wants the production in UHD then ICC also have to pay if its only STAR SPORTS then only they will shel out the amount. Currently DRS is applied in ICC events then ICC will jointly paid with STAR SPORTS for the additional technology if they want something extra.
And I am talking about budget for India. And there isn't many 4K operators across the globe. They are few. Infact if Tata sky and d2h will launch 4K channels on their platform, they would be leaders in the world.
Its about history and moving with technology, last World Cup was first ever WC to be broadcasted in HD many thought the same but now its become need for a time. Just like India, England, Australia, SA too might broadcast in UHD and if ICC wants to extend the Broadcasting in non cricket popular country. Its about reach and show the World the Cricket World is not small event just like Football.