That kind of outage doesn't really help Slackware. I've used Slackware since 1992 or 1993, I believe, and I would not change to any other distribution, but it is quite scary when you have a lot of work on top of a distribution that has its website off-line for that long. You simply start thinking if it won't last much more, and many people might start migrating to more popular distros. Anyway, the best way to avoid that is to support it, subscribing to it, or buying some stuff from the store. I won't hurt.