I think if you took some of the severe angles out of the linkage adjustment, and let the cable swivel hang loose, the throttle cable would last pert-near forever.
I love that linkage setup. I used to have one; it's like mechanical pornography. At one time I think Holley, Edelbrock, and Weiand all sold the same setup. I needed service parts for mine and called Edelbrock and they told me to call Enderle: "They made it for everyone--that's where we got it."