Your suggestion will only help in stretching the game and making the game dull and boring. If all the appeals are referred to third umpire then we would have to sit infront of the TV for a whole day, praying the God for early finish of the game. If bowlers are given right to appeal then they keep on appealing all the time this will cause unnecessary delay. Hence each time should be given limited appeals. say for example 5 appeals for every much. In doing so, bowlers will think and they will use the system wisely. hence unnecessary appealing and intentional and delibrate appealilng can be contained.
