Golnick,
"Benchmade liner locks have a small bump on the liner that the blade rides on. That will, inevitably, wear down over time and make the mechanism less smooth."
Are you referring to the ball detent? I began to worry about that part too lately. I think the biggest concern about the ball detent when it's worn is that the blade will open inadvertently. I have a few liner locks that are 'too easy to open' because the balls have become "too smooth".
I agree about the Axis Lock. If you see it form the side, there's a gap between the G10 scale and the liner just where the lock slides in it's path. I found out that it is too easy to collect lints in there, although I haven't seen an Axis Lock fails to open or unlock. The easiest way to clean that gap is to use pressured water or compressed air. I'm still unwilling to dissasemble an Axis Lock as it will void my warranty.
But I personally think although the springs will probably weaken over the time, they will last indefinitely.
Take care,
Reynaert