Our new S 100D has the "standard" 48A charger. We decided not to spend the extra $1500 to purchase the 72A charger, because of the 4 years of experience with our S P85 - once the supercharger network was installed, we never really needed more than 40-48A charging.
Assuming that we needed 80% of charge (staying between 10-90%) with our S 100D, with a 48A charger, we should be able to get back to 90% in 8 hours - which is fast enough to get a full (90%) charge overnight or at a destination charger. And when superchargers are available, they don't use the onboard chargers, so it doesn't matter if you have a 48A or 72A charger.
Since most S 100Ds will have the new 72A chargers as a standard feature - I checked with Tesla about upgrading our S 100D to have the new charger - and the cost of the upgrade is $1900 - what Tesla quoted when we ordered our S 100D in January.
For now, we've decided to stick with our 48A charger. If it turns out that we really could benefit from the 72A charger, we'll reconsider doing the upgrade. And, I suspect that as Tesla produces more of the 72A chargers, the price will likely come down - and a future upgrade could cost less than $1900. HPWCs were originally much more expensive - and those prices have dropped considerably down to around $500...
Though, I'm pretty confident 48A is enough, especially as more superchargers are added to the network...