I'm surprised that no-one's mentioned this, but most, if not all, of these systems are completely removable or disable-able.
Springfield's ILS system on their 1911s, can be ditched by changing the internals of the mainspring housing for under $10.
S&W's lock can be rendered un-lockable by removing one tiny piece.
Not sure about Ruger's, Taurus', or others, but I'd bet the same holds true.
If you refuse to buy as a kind of persoanl boycott of the idea, that's fine, I guess, and you should always stick to your principles if it doesn't inconvenience you in some way, or cost you anything.
If you're seriously worrying about the failure of the lock in a self-defense emergency, take the 5 minutes to remove it!
And if someone claims that your justifiable homicide will turn into a murder rap because the prosecutor will show that, since you disabled the internal lock on your gun you obviously set out with the intent to kill someone, please smack them because that is dumb.
-Sam