This isn't really enough for an answer, but it's too much for a comment. Sorry about the lack of numbers, but the IER (Wikipedia) put out a lot of "studies" which agree with the vested interests of the people who pay for them. Here's a hint of some issues in just that table:
The assumptions behind cost of keeping primary fossil plants available are ...
Hubbert curve has 50% resources used at the peak extraction (or construction, in your case).
Total wind potential is 95 terawatts (peak) or 28.5 terawatts average (at 30% capacity factor).
World electricity use is 21372 TWh or 2.44 terawatts average.
Even with 100% wind, we would be at 8.6% resource utilization, not at 50% resource utilization.