Steem is NOT finite like bitcoin's 21M maximum, because the inflation goes down by 0.5% per year but will stop at 1% per year (if my memory serves me well), and it will grow indefinitely.
But I still think there is not enough inflation in STEEM. Because this daily reward pool goes down. Right now it distributes about 50K steem per day, but when we will be at 1%, it will distribute something like 10K steem per day. So if the number of users stays the same, each user will make 5 times less than right now. If the userbase grows ten-fold, then each user will make 50 times less than now on average.
Aaaaand STEEM was super inflationary near the beggining, I was registered when it happened and it was crazy, your SP would grow super quickly naturally (something like double every two months if you were active). It was inflationary but fun and cool :)