It is funny that we can clone a whole creature like a sheep, but can't clone a hair follicle. From what i have read, while the injected hair cells do grow, the whole difficulty is regarding how to control the direction of hair once it starts to grow.
I am certainly optimistic that it will be available in 5 years mainly because this generation of balding men are way more look conscious than the past generation. This means that the market is much bigger now than say in the 90's, which in turn the potential profit is much higher, thus more funding for research.
Also with the internet, there are more collaborative tools available for scientists around the world, helping them to more easily share ideas.
IMO, 'in the next 5 year' is equivalent now to perhaps 20-30 years to when someone mentioned this same sentence in year 2000.