Stoutstien
lunk
See i don't think it ever grows to useless for the exact reasons why people think DR could be an issue.Maybe but it has the failing other have already pointed out. It is over effective a low levels and useless at high levels.
One of the strong points of 5e is that you never grow out threats so a lot of goblins could potentially kill you even at lv 20 so a moderate amount of DR wouldn't break this paradigm as long as DR is unable to create a scenario where damage becomes automatically zero. (Though it gets close to this already with AC stacking)
The second point that might cause issues is multiple attacks is the main way of scaling for higher CR/threats. Once again a moderate amount of DR will impact this but not to a degree you'd need to worry about restructuring the system. In a lot of ways it would function like THP. It can keep you upright longer but the threat is still valid.
The actual value is here probably need to be played with a little bit to find a sweet spot between avoidance (AC) and reduction (DR) that works better than what is happening now but it could be worth it. Why not poke around at it seeing we are on the early stages of a new edition anyways. Someone might stumble onto something amazing.
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