That only depends on the availability of my money because that's really a big amount if you wanted to buy it as a whole. For me, i will just have a slice of it of 2,000$ maximum and that will be pretty good figure for me to hold.
If bitcoin became that valuable I will try to buy other coins since it is likely that the fees of bitcoin could be very high if the lightning network is not ready, besides if you are really looking for ways to make money in this market then if bitcoin reached that price then it will be too late to invest in it and it will be better to keep your sight in promising altcoins instead.