That'll never happen. For starters, 1099 classification is very defensible. 2nd, if some drivers should be W2s, any type of deal would likely only be in the future. 3rd, in the very, very worse case, there's no way it would be 100s of millions.
Point being...under existing regulations, Uber/Lyft drivers are probably W-2s. But Uber/Lyft are lobbying hard for an alternative, and will probably succeed in changing minds about it faster than the government can move to crack down.