I'll give my opinions on the packs, their effects on the community, and then recommend some others.
This is a solid well made hard-style pack, that i'm certain will have brought members to the community, and will likely continue to with it's popularity. I think it'd be worth keeping this pack around for a good while, as I see it healthily populated regularly.
I've got a love-hate relationship with this pack. As fun as it is to have a whole **** tonne of mods piled together to play with, we all know the issues this pack has had from the beginning. Tracking issues in the cluster of mods this pack has is near impossible sometimes. We still have some people playing it, but I think given a healthier all-round pack option to go onto they'd be happier, and the Staff would be too
I only looked into this pack yesterday, I know little of what it did for the community as I wasn't here for it's release, and for a long time since then. However I think the poll for adding the Expert mode is very exciting, for me personally. It's one of the few packs that holds the new Thaumcraft, so it must be attractive to some of the modded community. I think as far as a normal-mode pack goes, this is fairly standard, and could possibly
Age Of Engineering
Oh my sweet sweet AoE. As much as I love this pack, I think it's served it's purpose. A few players recently started a new playthrough on it, but I really think it should be replaced. After the updates stopped on this pack so the Creator could work on his smaller project, this pack didn't get the love it needed to fix up some of it's horrendous lag issues. I wouldn't mind seeing it brought back to the community with a fresh map one day, as I remember the launch of AoE was a very healthy and busy time for our community.
The current system for the Skyblock slot is perfect in my opinion.
Onto some new packs i'd recommend.
Enigmatica 2 Expert
I know this is already in a poll, I just want to reinforce that I think it'll be an excellent addition if it does get through.
I played this pack a little, just felt like a solid all round pack, had little to no performance issues. Could be a replacement for either ATM or Enigmatica 2 Normal. Although the major hype for this pack is way past, I still think it could benefit us.
Quite a unique expert-mode style pack, machines all the way to the end. Most bugs are patched up by now. I put 450 hours into a playthrough on this, so it can eat up some time if you don't rush it!
I haven't played this pack, however I think it looks very cute and unique, and I know some people in the community would play it for sure. Just another possibility.
Hope all this helps somewhat.