If Philadelphia truly needs more cabs, then Uber can't be blamed for the collapse in medallion prices since it's clearly NOT filling a market need.
In New York City, where the medallion owners are demanding some sort of bailout from City taxpayers, all Uber drivers are regulated under the existing TLC system. I'm no fan of Uber, but they've operated and grown in NYC within existing restrictions.
Tried to comment on the article itself but their goofy Facebook bound commenting system failed with any of the accounts I tried to use.