Not sure if I'm getting an interesting conversation going or just getting folks riled up (like I said, I'm not advocating that people abandon the historically sound 4% SWR), but one other thing I think about is that my ability to earn and save now might be better what the US workforce may see in 10-20 years, which includes my children's early career. Technology is replacing jobs and a palpable chasm is widening between the rich and the poor. Sure, if my kids make it into the remaining '1%-er' jobs they will be fine, but I'm also increasing their odds for success by being capable of giving them help (graduating with no student debt, providing health insurance until they are on their own, possibly even helping them with a downpayment on a home, etc.). If you believe we are in a transformative period in terms of the future of work, I'm not sure how you can feel prepared for it by repeating what worked a generation ago. Back then, people spent their whole career at one company and had a defined pension, buying stocks involved calling up a broker and checking the price in the newspaper, and healthcare and college were generally affordable for the rising middle class.
Also, I'll reiterate, my situation is somewhat different than folks itching to ER. I in no way feel that working extra years or having less time in retirement is a negative for me personally. I love the lifestyle I get with my job (especially the variety of experiences) and will only head off into the sunset when I feel like it would be an improvement (like I'm burned out at work or feel too old to keep up), or when they fire me. I'm only saying this so people understand my perspective, what works for me might be different than what works for you...