Am I right that the bottom line and crux of this issue, is that PUG's of random noobs will blast through all the content the game has to offer?
If so I think trying to avoid that is important. Although I trust that Slaar and Co. that they will solve everything eventually and they'll do it well. I have played this game since before it was even called Shards of Dalaya, and it just gets better and better constantly. I don't wanna seem preachy but sometimes I feel a hint of doom and gloom, and I just wanted to point out that this game is pretty awesome and it is constantly getting better. I have several month long breaks and every time I come back the game has improved yet again in leaps and bounds. It's easy to forget that, but even long time issues that I thought would never be fixed (like the super annoying link dead bug) have also been fixed now.
So I could never be critical of Slaar or the game. I have a great PC and I could play any game, but I choose to play SoD just because it's the best. I only pass my opinion because I hope it helps, and it's also easy for me to be impartial because I have nothing to do with raiding (of any kind) anymore.
Back to this issue, assuming people blasting through the content is the main point of this thread, then I think using keys to manage it is a good option, and I support that. Ideally I would like the idea that each individual player, has to successfully 'complete' around 70% of each raid tier before they can progress to the next tier. Either doing this through quests, gear, or keys. That way a super powerful character is never going to help a bunch of newbies race through the tiers because the newbies need to go step by step, no matter what.
As I said in some other thread though, I don't think the game should be TOO concerned about people who 'beat the game'. It is sensible to try to make progress smooth! But I think we should admit that it is an inevitability that some people are going to achieve everything and get all the phat loots no matter what. Whether they do that in a guild group or in a pug, they are still going to do it one way or another, but - it doesn't really matter. All that matters is that they enjoy themselves. Once they have everything and have done everything, they will quit, and that's fine. As I said, I've been playing this game since before it was even called SoD. I have been in a few of the top guilds, and none of them exist anymore. And in fact, 99% of the players I used to see playing, are all gone now. There are only around 3 names I still see from the old days.
Even my most recent big guild, it's all over now. We were one of the top tier guilds who were doing great and getting all the phat loots. But the main tank quit more than a year ago and has never been seen since and another two founding member types quit around the same time. The guild had a very good year after that, but the guild has since ended. One guy is now married, one burned out, and one just did pretty much everything and decided to focus on real life instead. I'm not sure what happened to the others. There are only two players I still see playing who are now in another guild.
My point is that people who get everything, are not really a problem, imo atleast. It generally takes at least a year or more to get to that point, and then once they quit, they leave the game with good memories and make room for the next generation of players to go through the same experience. And that's what MMORPG's are all about imo. I feel a bit like a SoD historian because I can remember the whole journey of the game, and I know that most of the people I see playing today in guilds and pugs, were not even here a year ago. And I know that of all the people playing, the ones that were here 4 or 5 years ago, it's probably less than 1%. There have always been people who have achieved pretty much everything, they then quit, and new players took their place. It's been happening for several years, and the game is still going strong. So as long as you make sure nothing screws up the winning formula, I think the game will continue being great.