Too late, probably (open-sourcing, not the threat of monoculture). The owners of Opera AS (a Chinese VC as of now) aren't probably interested in that. It would

Too late, probably (open-sourcing, not the threat of monoculture). The owners of Opera AS (a Chinese VC as of now) aren't probably interested in that. It would be much more probable that Microsoft will release IE under MIT over open-sourcing Presto.