The market has already decided. There are alternate cryptocurrencies with no hard limit on quantity.
Nobody uses them.
Amazingly enough, when people are free to choose they tend to choose to hold the currency which gains in value over the one which has a constant or decreasing value. So far no amount of persuasion works to convince people that they should reverse their preferences, so that's why advocates of those other systems can must constantly attempt to remove the features that people actually want in Bitcoin.
See
http://en.wikipedia.org/wiki/Gresham%27s_lawIf this holds up then people will be using alternative non deflationary coins and hoarding (not using) bitcoins.
That wikipedia article is in serious need of editing LOL
The queer notion that our human, public Medium of Work-Resource Exchange needs to ALSO be some other "commodity" that can easily be monopolized by any elite gang of "economic winners" to thus enslave us into debt to their "lending" monopoly, is BAD MONEY, not good.
This arises from the confusion of idiots who stupidly confuse a "money" (token of the limitless Prime Resource of all labours) with a wealth (some scrap-token of some hoard of mere inanimate and unproductive yet rarer junk).
A junkyard full of scrap cars contains thousands of rare parts worth thousands of times it's value, but one would not be right to regard it as a "good money".
The wikipedia article needs to be edited to describe the contrast between the coin and paper as that between a "dangerous, finite, limited-commodity token" and a "safe, properly growth-elastic and unlimited-resource token". In other words, dangerous money versus safe money.
Whenever there is not enough of a Medium of Work-Resource Exchange to put some in everyone's pockets an economy faces catastrophe!
It's not what you make money out of, or even what it's worth that ever really matters, it's WHO "OWNS" IT! (all?) ...that does!