Removing crit: A waste of resources?
Here, you can find a relatively active (lengthy) post describing the pros and cons of crit as a mechanic in League of Legends. Personally, I am not entirely certain whether I like crit as a mechanic; suffice to say, I do not think it is ruining League of Legends. (I'm not going to defend my position; for arguments for/against crit, check the link.)
Because I don't think crit is ruining League of Legends, my personal opinion is that even if League would be better without crit, I don't want to see it removed. Removing crit would change the balance on all sorts of champions and items (in some cases even require new abilities/stats) and require a lot of design/development resources. I think we can all agree that there are a lot of moving parts in League, and champion/item design/rework requires all the resources that Riot can possibly give it. I would hate to see a ton of effort go into re-balancing the game around the removal of crit, upsetting the balance of the game even further for not enough reward (in my opinion).