If arrows become less prominently found in the world, then where are we going to get them? In Oblivion, glass was the highest arrow to be bartered with, and even then in limited quantity. I think this will limit a lot of the options Bethesda has sought to create for players in terms of combinations of weapons, spells and skills. Particularly it will impact those with a slight outside of the box thinking in terms of classes, such as one of my favorites, the heavy archer, which uses heavy armor, blades and archery as its main skills, and thus rely less on stealth, and more on a greater stock of arrows for powerful adversaries.
I think this may be a trend in recent games. Niche tweaking the sandbox and mechanics. It appears that, while wanting to create a defined role for a lot of the sandbox and mechanics, it limits the players ways of tweaking these, which is easier when they have a broad appeal. By pushing certain weapons into a defined role, the player must then presume a defined role, not using whatever is found to their best abilities and find new and intersting uses. Another example is Halo 3 and Halo Reach. Halo Reach has got a lot more defined sandbox, with an almost set role for each armor ability and weapon, which was a design choice by Bungie. But, when they did that, the flowing sense the gameplay had got in Halo 3, where your weapon could be picked up and disgarded at will because of a broad appeal, was more or less gone. In Halo 3, you had equipment you could pick, and use, such as a bubbleshield or a gravity lift. Halo Reach offers armor abilities, most of which are reskinnings of Halo 3's equipment, but can be used more than once. However, the downside of this is that you can't change your armor ability without dying. In Halo Reach, weapons are more scarce, and game mechanics aim at making each player on player encounter last longer, which gives for a totally different playstyle and feel, which some might enjoy, and others not. I fear that Bethesda will do the same with TES V. We shall see.