Are you comparing an experimental technology like Germany's fusion reactor to proven wind generation that is driving commercial reactors out of business?
http://midwestenergynews.com/2015/05/01/exelon-we-have-to-ha...
http://midwestenergynews.com/2015/05/01/exelon-we-have-to-ha...
I could have also pointed at Google's Sunroof project as an example of a large company betting that solar can compete:
http://www.extremetech.com/extreme/212363-google-is-launchin...
I couldn't guess what energy producing and distribution technologies will be most prevalent in 100 years.
Advancements could just as easily be made relating to fission reactors, so I don't think it's fair to say that large power companies shouldn't invest in more reactors. But, I agree there is probably risk in investing in them.
https://en.wikipedia.org/wiki/Altamont_Pass_Wind_Farm
It's not clear from that what the other operators are doing, but there seems to be some work put into replacing smaller turbines with larger ones that are less disruptive to birds.
Funnily enough, these old wind turbines are worth good money in pure raw materials. Expect near 100% recycling for them.