$\frac{2^{75.51747}}{8\ast 10^9}=6.759797398\ast 10^{12}=2^{42.62012}$

So each person would have to generate approximately $2^{42.6}$ or 6.7 trillion keys for there to be a 0.1% chance of a Segwit address collision.

So time to switch to taproot? hmm