I think it risky to think we might live to 100 soon. Basically, according to here
Life expectancy is different from lifespan. The significant increase in life expectancy over few decades was mainly due to reducing childhood mortality and the introduction of antibiotics ....that does not mean our natural lifespan has increased

Anyway, to cut short, it is “risky” to plan for living to 100 because your delayed gratification gets longer and what happens is you are likely to die from working before you reach 100... in other words, there is no RE at all because you over budgeted( not saying one must RE after achieving FI)