I wouldn't worry about the max supply at this time. 5% is not as much as it sounds like and it will take years before there is a significant increase / inflation and by that time the user base will be larger, fiat currency inflation will increase etc. If at some point it seems inflation is an issue or threat to the network there is always the possibility of adjusting the PoS to a reducing scheme. This would require a sufficient number of transactions to provide enough fees to satisfy node owners. At this time I would not worry about the max supply. We need to get all the core features running perfectly and then expand on that. Privacy is the key and the supply is in reality quite low. There are only a few hundred thousand in circulation being traded.