Hedging and speculation using options has been around a long time. I don't think they fully explain the remarkable growth in options volume. Some other explanatory factors include:
1) ETF's: They used to be considered exotic alternatives and now they are some of the most popular trading instruments. Many have options.
2) Electronic option exchanges: Have nearly replaced the floor trading. Tighter b/a spreads and less slippage overcome some of the former knocks against options.
3) Brokerage support: Brokers have increasingly provided options capabilities in their platforms.
4) Education: Infomercials, online forums, books, and mentoring programs all spread the word about the features of options and increase demand through awareness.