Ah Jerome, you marvel. I keep trying to find a succinct formulation, to refute all the nonsense about having to balance at the level of one turbine, one wind farm, one technology. And there you've done it in one beautiful paragraph. These words I'll treasure and propagate, with credit where credit's due:

The best place to do a mix of technologies is the grid itself - it is completely inefficient to try to have each producer be a perfectly balanced supplier - better to do the fine tuning of the system at the system-level, where all the individual movements are blended and blunted, and the adaptation effort can be smaller, in aggregate. Jerome a Paris, 2011