So, by my reading of the post with the updates in red, here's what we get:

-- Dynamis is now going to be a 1-2 hour daily event instead of a 4 hour bi-weekly.

Frankly, there goes our shell. I'm not even sure our LS leader plays XI anymore minus about 5-6 hours on Sunday for the shell. Sometimes, it's pulling teeth to get decent players on there.

-- Time Extensions can be gained from defeating certain monsters, but the key items which grant them can only be one at a time, and lost upon exit.

That's nice. Now, how do you stop people from monopolizing the "certain monsters", preventing other groups from progressing?

-- Boss NM's are Confrontation-style. Attestation and Fragment NM's become standard-style with one opponent, instead of mass spawns or Warps.

Confrontation is not a completely new mechanic. It's used in Fields of Valor NM fights and some WotG missions and quests. Kind of an open BCNM, as it were. Making the Attestation and Fragment NM's standard fights "on-1" indicates they wish to increase the number of people actually completing relics. (Which they plan to update.)

But there's one major problem they don't address yet. How are you going to prevent a cockblocker from literally rampaging the zone and MPKing everybody, leaving semi-exclusivity and the probability that, with enough people cooperating, a smaller group of people can control currency prices -- since it is clear that you probably (short of shout groups) can't do a relic through your own Dynamis anymore after this update.