A VIX etf is theoretically easily possible, but in reality, there are problems: - Constantly needed portfolio adjustments (paid premiums) would very likely create extraordinarily high maintenance fees. - We could need more than 1 etf: IV for 1M, 3M, 12Months
Options on the VIX expire next Wednesday. THAT, combined with tomorrow's equity-option expiration is "skewing" the VIX index.