^ I've been wondering the same thing. I suppose there are really only so many ways they could fail though: (1) the rubber boot could tear, causing the endlink to lose grease and it could fail that way, (2) the ball could pop out of the socket or the end could otherwise fall apart, (3) the rod could shear in half or just off of one end, or (4) a bolt/nut could break.
On the bright side (if they do break), I'm sure there are plenty of people who have stock front endlinks that they'd be willing to get rid of cheap. Also, it's not too big of a deal to ride around for a little while without a fully attached front or rear sway bar as long as you take it easy around turns until you get everything properly hooked back up.
07 WRX (Albins 5MT + Blouch 20G)
Jorge Carrillo Tuned (365 whp/340 wtq)