Again, this is not necessarily the case. The idea of taking the human origin hairs on the mouse and transplanting them into people is a possibility to try at this point. It's only a matter of them getting the will to do it. The question that needs to be known is why these cloned human hair cells can grow on mice but not on humans. This is the mysterious area that needs to be understood. Why are mice so great at growing hair whereas people it seems our bodies want fewer hairs after a while.
I mean, isn't the idea to transplant the hair that they are able to grow in mice to a human so obvious that these researchers must have come across it already? It would highly surprise me if it would be a novel concept to them. I guess they are either considering or planning it or have rejected the idea for reasons unbeknownst to us.