Give it time. This too shall pass.
"The market" doesn't do things. Saying that the market will take care of something is like saying the internet will take care of something; it requires a willful ignorance of the details.
Markets are human constructs designed to achieve particular ends. They have known failure modes and monopoly is one of them. There is no reason we need to sit around waiting for a monopoly to self-destruct, paying monopoly rents and having progress stifled in the meantime.
I don't think we'll see the domestic players merging but rather an increase in international joint ventures that effectively constitute a merger. Petrobras and Shell, TNK-BP and so forth.
Again, no strategy works forever, they work for varying lengths of time.