Would learning to ride a unicycle boost biking skills? Unicycles are not particularly expensive, seem to be light and portable, also fun. This gets me wondering if spending a couple of months to learn riding such a thing would boost a mountain biker's coordination, balance, timing, reaction, fall handling, etc. Or would just riding the intended type of trails be more educational?

EDIT:
To clarify, I am sure that doing something is the best way to get good at it. However, I am also aware of the law of diminishing returns. That is, if one's idea is to be good at mtb, maybe after a lot of riding, they should consider other activities, hat are only somewhat beneficial in the same direction.
Here's my contribution: There is one bicycling skill that improved a lot after I learned unicycling: Riding the bicycle with no hands. 
Before unicycling I could ride the bike with no hands in a straight line and do wide turns.
After unicycling I was a lot more confident to go over obstacles and do narrow turns.

Now when riding some long distance biking, I often leave the handlebar for a while to straighten by back and relax. Even in uneven or difficult tracks. 

Apart form that, it contributes to your leg strength and general balance.