You are asking those who form a tiny niche of the overall MMO community (those who remain at DAoC are mostly RvR centric where the typical MMO player is PvE centric) to give their views and you think that the answers may improve some other game.
WarHammer was designed to attempt to cater to the tiny niche of PvP players. WarHammer has shown that it is not a very profitable idea to cater to the tiny niche. It is good to have the niche people in your game, but it is best to have the tiny niche surrounded by millions of general players rather than just having a few tens of thousand niche players.
While I understand the questions, and the answers can bring some interesting insight, I disagree with the paradigm the questions seem to be based on. . . . but I will still give answers.
Relic system?
A good idea. It helps give purpose to Realm Pride. The rewards need adjustment but the basic idea is good.
Realm Ranks?
Not a good idea but not terrible. RRs began the shift of focus toward selfish goals. Selfishness is inherent and already pervasive in the human condition, any promotion of selfishness can cause game problems that quickly grow out of control.
Realm Ranks that are built around helping your realm mates and/or built around accomplishing realm goals, would allow realm ranks to exist but would counter some of the natural selfishness that is typical of the human condition.
Realm abilities?
This was a huge nail in the coffin of Realm Pride and it dramatically contributes to the Min/Max challenge that gives, and has given, DAoC huge challenges.
I like RAs and I would guess that most players like them. Liking RAs does not change the damage RAs caused to DAoC.
In the old days it was Realm vs. Realm, it was a call to arms where players would suicide to get their characters to the frontiers and help defend the realm, but today it is “If you steal any of my RAs I will find out where you live irl and . . . .†Today many worship the RP/RA demon and care nothing for the realm they play in.
Titles and lifetime stat tracking?
Nothing wrong with this as long as the majority of the stats that are allowed to be tracked are not selfish stats that move players toward psychosis or move players against realm pride.
WoW allows players to track hundreds and hundreds (if not thousands) of stats. Some players are not driven by stats and others are. Those players who are driven by stats should have access to track them.
You left out something else that I bleieve is critical.
Something like a DF where PvE players have incentives to PvP a bit more so that they can gain access to great/fun PvE dungeon(s).
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The art of war is simple enough. Find out where your enemy is.
Get at him as soon as you can. Strike him as hard as you can,
and keep moving. - Ulysses S. Grant
Only the dead have seen the end of war - Plato