my calculation come out to be about 1.8 million coins per day, based on 15 seconds/block and each block is 314 coins.
is this correct?
Yes, we're on track to be around 1.8 million coins up from yesterday. So in 6 months there will be around 182 days*1.8M = 327.6M more coins in existence than today, or over 400% increase in supply.
Scarcity is really important. Unfortunately without any controls in the protocol to regulate the supply I can't see this going anywhere as investments will be rapidly devalued as the supply grows.
but why so much supply? with so much supply in circulation the price will fall to much i think, i cant believe that 1 coin is more wort than 1 cent in the future