Sure it will be harder to find a fight. In all those fights, one side had to travel to those guard zones and now that will be much harder, not only that, with having your crafter tied to your fighter most will need to be much more careful what fights they take.
I don't think most people bothered to fully build their grief characters, so plenty will just have an extra account or two and keep rerolling like before.
Boulder holders were not very much used after the new houses were introduced. A house could be built cheaply and filled in a couple of hours practically anywhere and you could do nothing but siege it, but that didn't let you have or destroy the boulders. Using boulder holders no longer made sense.
Solo players will have more trouble, and guilds will need to be even bigger than MO1 in order to have all the crafts covered (not a good thing, in my opinion.)
Half of your character will have to be a crafter whether you like it or not, because half of the points can only be used for crafting, and taming is under the combat half of the skill tree.