In other words, prices of goods (in bitcoins) will (eventually) stop deflating, even though there is a fixed quantity of bitcoins, because other cryptocurrencies will be introduced.
The total number of bitcoins in circulation is capped, even though the total quantity of wealth in the world continues to increase.
If bitcoins were the only currency used, then yes, this would cause hoarding problems. Does this mean bitcoins are flawed?
No. It just means that there is a cap on how much wealth can be purchased with bitcoins.