Rich countries want unfettered access to poor countries' markets, which are often heavily protected by tariffs, but they don't want to give up all the protections for their own goods and services.

Pretty soon, we should see a few large regional blocs dominating global trade. The ones that lower trade barriers faster will grow faster...

The WTO has outlived its usefulness as a setting for trade negotiations. It can still be a good place to resolve disputes (though this can take years) and share ideas, but most countries would be better off choosing their own trading partners and lowering trade barriers at their own pace.