My guess is it will be back. Just a hunch based on watching similar things happen. This post will likely result in it coming back sooner and/or having a better plan for staying up in the future. Upvote it please!
Even if it's propped back up, having been extremely quiet for a prolonged period, and then conspicuously broken could pretty reasonably be expected to push participants to a different venue, don't you think?
There's quite an area between a blog that can't be accessed and a blog that is at its peak. I hope it will find a good spot in that area, since reaching a new peak is unlikely.
I'd be happy to see the kind of discussions that happened on Lambda The Ultimate thrive anywhere, so long as it's reasonably open. Stack Exchange is pretty good because it puts content under a CC license: https://stackoverflow.com/help/licensing I thought there was a programming lanugage Stack Exchange but I'm just seeing https://softwareengineering.meta.stackexchange.com/ - and there's this question: https://meta.stackexchange.com/questions/309740/where-to-ask... On the other hand, StackExchange tends to resist open-ended questions. Perhaps a Discourse (cofounded by a Stack Overflow cofounder) would be a good spot.
I'm really hoping it will come back up even if it doesn't get new activity because archive.org isn't the same as being able to just link to an old post.
Even if it's propped back up, having been extremely quiet for a prolonged period, and then conspicuously broken could pretty reasonably be expected to push participants to a different venue, don't you think?