So, the idea is not that you "switch" is not right. If you start your withdrawal period with some bonds (or cash or whatever) and draw those lower yield funds first, your equity will have the opportunity to grow regardless of market volitity during those early years.
Or you could be heavier and equities and hope that you don't get a bum sequence of returns.
Or you could work a bit longer for a lower WR overall.
All reasonable strategies depending on how well you roll the dice. Since there's no clear path to the future, all three could be argued for.