As unfortunate as it is, it will actually increase demand for bitcoins through random people who have never used it needing all of a sudden to buy it.
In other words it will bring new people to the technology some of who otherwise would have resisted it to the end.
Yes despite the fact that bitcoin is being used intensively for criminal purposes, this illegal use cases are playing important role in increasing demand for bitcoin.
Current buzz around this ransomeware may have positive effect on bitcoin price rather than any negative one.