The dependent student lifetime limit is $31k btw so you'd need to have basically no income for 10 years to raise it to $50k, or you'd need to be older or go to grad school.
Either way it's unlikely that you spend much time not making enough to cover interest payments with the minimum payment.
In the case that you do spend years with basically no income, you aren't likely to start making enough to build assets significantly faster than you are paying down your loan because the minimum payment are pegged to income. Most people with low enough income for this to be problem are saving at most few % in their 401k, and are renting a home.
I'm not saying that this can never happen, but you'd need to perfect storm of circumstances for it to be a major issue. And regardless, the tax burden is never going to be more than around ~25% of your assets--even in the worst case.
>25% of people have >$50k in loans - and unfortunately not all of them are doctors
That's including private loans, which don't come with income based repayment, so it's irrelevant.