We don't think it's a problem. The supply will be a key for the Marketplace and Masternodes.
If we compare the supply. It will still take 4 years before the supply will reach todays Ethereum coin supply.

A lot can happen over the next four years.

At the moment we have no plans to put a max cap.
It can of course be changed if we later implement a voting system and the community wants a decrease in block reward, switch to POS,  permanent masternodes network or other.