For mr its not the horse but the sport, the riders, the entertainment, the technology, the politics, the soap opera drama, the history. I cannot yet foresee a day when I won't be interested in MGP as it evolves.
The demographic of the sport will/is definitely changing and as the fad of sportbikes with kids seems to be fading in the west due to economics, insurance, law enforcement, other options... markets like China, India, SE Asia, S America will grow enormously. Insurance for a litrebike here is about $300/year and you can ride the country from top to bottom (BKK excluded) on great roads at any speed you wish.
I have re-watched the Sepang races and the Moto2/3 races really are a high-water mark for SE Asian motorcycle racing thus far. The feeling of "something special" mixed with the monsoon that day.