Simple answer? Gas prices don't effect ubers bottom line, only yours and uber literally couldn't care less about you
Let's suppose for the sake of discussion that there is some unknown event that causes the price of a barrel of crude oil to plummet - a discovery of a new oil field of mega-proportions, a new process to cheaply refine oil, something causes the price of oil to drop. As a result of this, gasoline prices per gallon drop to unprecedented lows, prices that haven't been seen in almost 40 years - say, .80/gallon.
The $64,000 question is... What do you think that Uber and/or Lyft would do to the rates they charge?
Would they hold steadfast with their price structure, and allow drivers to make decent money driving? Since the #1 expense of drivers has fallen to new lows, drivers should be able to make more $$ per mile driven if the price of gasoline drops.
Or, would Uber/Lyft lower the rate they charge riders? "Since the costs of fuel have dropped, we'll pass that savings on to you, the rider!"
I can only guess what they'd do if this was to take place, but I imagine that the drivers would get the short and dirty end of the stick - as usual.