I believe most damage to bike's market is due to emissions restrictions imposed by the idiots in Brussels.
I know some brands are trying to go around it by creating hybrid engines for bikes but that only adds to the cost with no real benefits and by making a heavy bike even more heavier.
Then you have a stack of pointless technology that isn't really needed, thinking of reversing on the Goldwing, and only makes the bike market harder to get into or available to the few that can afford it.
The low cc market gets away with it, for now, because they are naturally low emission engines.
Just wait until someone finds a way to grab some taxes out of it...