We have to overhaul the entire death system, and come up with a witty new comment for Death after he already made one when infinite XP holes were closed?

Where's the logic in that?

Dwarf stat advantage is 25 racial max con. That's it. The benefit of keeping it that high is a higher max HP.

Beyond that, just because it's a quirk of that stat that the dwarf loses his 'greatest prime stat' does not mean either:

A: he loses the HP regen. Big deal, so does every character in the game. The fact that he has slightly better HP regen at 25 does not automatically make this an issue special for dwarves.

B: Their trains that go into con are somehow more valuable than they are for another character.

C: The con stat is the dwarf's greatest and only advantage. Uh, I'd say at this point their resists, the legacy choices (to go with their good align) the potential to be a paladin that racially never has to be as formal as all of their other peers in terms of personality, forgecrafting (for those players who choose to learn to take advantage of it to improve their favorite gear pieces), resistance to magic attack types/disease and their detection of hidden passages are all cumulatively much more important to consider than 25 current CON eroding through the course of normal gameplay.

Don't use this argument as a wedge for 'dwarves are underpowered warriors'. You'll get busted over the head for even trying that weak argument.