Again, the Tioga road opening has nothing to do with Mammoth Mountain ski activity. It's just another conspiracy theory. It's all about snow and rocks on the road. I've watched the history of this problem since 1975; it's presents the same situation year after year.
The two airlines that service Mammoth, Horizon and United, operate year-round. Mammoth has much more going for tourists than skiing: hiking, climbing, fishing, etc. The airlines are responding to the present ski market.