What did the weakness of the league of nations in 1928 suggest about its future effectiveness?

  Well the U.N. is a more stable form of the league but its still not very effective because most countries have a mindset and plan of their own, but they try co operating with the UN. 

The Leagues weakness suggested that there be a more stable form of it and more co operation from other countries. (Now the UN has their own military practically.)

Political forces often influence public opinion.