user1417: Are there any ways to increase the Bitcoin maximum coin limit, as a wider adoption would mean there would be a lot of real money chasing fewer number of coins? Also can one hold a fraction of a coin?

user1423: The reason there is a cap to the amount of Bitcoins is to create a design that should increase in value longterm as opposed to decrease forever as FIAT does. 
Noone would want to invest in a new currency that was designed to decrease in value.
Since there is no limit on how small size a Bitcoin can be divided to. 
A single coin could be made enough to cover the whole earth if all the 21 million coins are lost.

user323: A single Bitcoin is currently divisible up to 8 decimal places (giving you 21*10^14 units of money, or about 2.1 quadrillion units), nothing stops it from being divided further with small protocol change. In order to change the limit of Bitcoins created, one needs to change the protocol and force most of the Bitcoin network to adopt the change, which can be quite hard to do. This hard limit of the amount of Bitcoins is one of the features of the system, not a flaw - it is meant to fight against inflation. If for some reason you want a cryptocurrency without a limit (hint from Lohoris: you don't), try browsing for alternatives.
All in all, there will be enough Bitcoins to go around for everyone for a long while.

1417: <p>Are there any ways to increase the Bitcoin maximum coin limit, as a wider adoption would mean there would be a lot of real money chasing fewer number of coins? Also can one hold a fraction of a coin?</p>
 1423: <p>The reason there is a cap to the amount of Bitcoins is to create a design that should increase in value longterm as opposed to decrease forever as FIAT does. 
Noone would want to invest in a new currency that was designed to decrease in value.</p>

<p>Since there is no limit on how small size a Bitcoin can be divided to. 
A single coin could be made enough to cover the whole earth if all the 21 million coins are lost.</p>
 323: <p>A single Bitcoin is currently <a href="https://bitcoin.stackexchange.com/questions/3663/why-can-we-have-small-fractions-of-a-bitcoin">divisible up to 8 decimal places</a> (giving you 21*10^14 units of money, or about 2.1 quadrillion units), nothing stops it from being divided further with small protocol change. In order to change the limit of Bitcoins created, one needs to change the protocol and force most of the Bitcoin network to adopt the change, which can be quite hard to do. This hard limit of the amount of Bitcoins is one of the features of the system, not a flaw - it is meant to fight against inflation. If for some reason you want a cryptocurrency without a limit (hint from Lohoris: you don't), try <a href="https://bitcoin.stackexchange.com/questions/1895/what-bitcoin-esque-alternatives-are-there">browsing for alternatives</a>.</p>

<p>All in all, there will be enough Bitcoins to go around for everyone for a long while.</p>
