Will there be a point where Riot simply ditches the current game engine for a new one?

At some point, League's current engine is just going to stop working for their purposes. Whether it's new Champions that can't fit the code, or far too many unfixable bugs, at some point I think that Riot's going to just want to go to a "League of Legends 2" game engine that far better fits their needs (i.e. an engine that can support multi-unit control). Is this an eventual plan, or has Riot dug themselves in too deep with the current engine?
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