Lots of good points on the VIX issue, but my opinion is that a huge immediate spike will still result in a large move in the VIX calls which will provide partial insurance against the spread losses in a huge move lower. As Cache said, this is not a locked in hedge. If the VIX spikes, the idea is to sell the calls to take in the profits and close out your spreads if the large move lower hurts you. Although it is speculation, a 20 Call priced at $0.35 cannot barely budge when the VIX has spiked to 60.
If VIX was forecasted to increase over the next 6 months or so, for example, the ITM puts would trade at a slight discount but they trade at their intrinsic value to buy at a minimum. I cannot forecast what the exact option values would be on a spike to 60, but my opinion is that it would have a huge surge as well, even if it is known VIX moves back lower, the point is no one knows when. However the fact that these VIX options are worth at least their intrinsic value leads me to believe that there will still be a significant move in the options.
If VIX was forecasted to increase over the next 6 months or so, for example, the ITM puts would trade at a slight discount but they trade at their intrinsic value to buy at a minimum. I cannot forecast what the exact option values would be on a spike to 60, but my opinion is that it would have a huge surge as well, even if it is known VIX moves back lower, the point is no one knows when. However the fact that these VIX options are worth at least their intrinsic value leads me to believe that there will still be a significant move in the options.
Remember this is for large major nasty moves lower.