Regardless of when escrow ends for the shares, the guys these shares are going to aren't going to sell out with a market cap of $100m, $200m or even $500m.
The companies they build are game changing, market leading, multi billion USD companies.
Anyways, our dollar will be at least 65c to $1 USD by then (maybe even lower?), which would mean a $500m AUD company is only worth $325m USD.