This has happened with nuclear and hydroelectric. It will happen soon with wind if it continues to increase as a viable source.
I don't think you have to worry about wind becoming cost effective, for a very long time. Wind power has lots more problems than we are led to believe, and the "environmentalists" are already attacking it, anyway.
Solar is well on the way to becoming much more cost effective in the next few years, so it will be the next big target for criticism.
Geothermal shows great promise for 20 or so years out. I've already heard one liberal express concern about cooling the interior of the Earth.
Locally, my university is already trying to convince people that geothermal energy use causes earthquakes. Big headlines in Dallas paper note 2.0 richter level quakes and how people felt it and how ‘they are not sure its caused by geothermal
It is such an utter lie and yet I can see how this intellectual industry of observing microquakes will be used to destroy all access to resources under ground.
Wind is a rather large contributor to the grid in Texas. I still think coal is much better but know its all going to regulated to try to choke off capitalism.