Well, if you manage to keep up with inflation, then 4% WR will get you 25 years before you are broke (100% / 4 % = 25 ).
1) If you manage to get a bit of gain, then you can stretch it out to 30 years.
2) Or if you get to SS, that also helps.
3) Or if you don't expect to live another 30 years, you should not worry about money, but about other things.
In my case, all 3 conditions apply. So, me worry about money?
It's just that we should give up the idea that we can draw from our stash to live a leisurely retirement, yet it just keeps on growing and growing and we will be able to leave behind a big legacy for our offsprings.
No. We should accept that there's a strong possibility that our stash will shrink and shrink with time, just like our body (well, some parts of it anyway).
But getting broke? No, not unless you mess up really big.