I understand what you are saying, however it's not 100% certain that you or anyone else will have an issue with the keyboard. Yes there have been issues, which is why the 1st and 2nd generation are included in a repair program.
The 3rd gen keyboard inside the Macbook Air might have less failure rates. The reason i say MIGHT is because we just don't know, people on the forum may point to there being reports of such issues and there is even a thread about it, however what we don't know is how many Air's have been sold and how many people have had issues, most of the time people don't post when everything is working ok.