tulip bulbs can be grown, and regrown. so theres no fixed quantity.

the whole tulip mania started because the first introduction of tulips into europe was rare, with only a small number of bulbs at first. everyone wanted them, then as years passed the supplies increased. so of course there became a point where it became common for everyone to have tulips thus devaluing it because everyone could grow their own.

bitcoin is fixed meaning there wont be anymore beyond that amount (21m). and with such high difficulty and such a large population base. not everyone can successfully mine sufficient amounts personally to sell for a nice lifestyle, so buying them is still and will continue to exceed natural supply growth while we reach the 21million.

bitcoins can in no way be compared to tulips and if a economist thinks they can then he has miss spelled his profession. and should be a ecologist, and go back to gardening.

that being said..
generic tulip bulbs can be bought 400 years later for £5 in the uk ($7.50) which is more expensive then feather coin or terracoin, and rare tulips bulbs can exceed the price of litecoin.

so i wouldnt call the tulip mania a complete disaster. the only failing is that there was no limited and finite supply to ensure value continued to rise, along with demand