I find myself in agreement with SASless on this issue.
Several of the major oil companies in the Gulf of Mexico have already begun the transition to using only twin-engine / IFR capable aircraft. Liability is probably the driving factor, and there's still a ways to go. Nonetheless, if you're flying for one of the "big boys" things have gotten a lot better over the past few years.
GoM helicopter operators have instituted some policies specific to small ships and we now have enhanced operational control from management, both of which help mitigate the risk. However, if the customers can afford to operate the better equipped aircraft - and all indications are that they can quite easily - it seems pretty short-sighted of them to accept the additional risk in order to try to save what amounts to a "drop in the bucket."
-Stan-