Maybe these have already been addressed, but here they are.
1) Early adopters may have stashes of millions of bitcoin. If widely adopted a few super rich could have a huge influence over the whole bitcoin economy. Imagine owning 5% of all USD in circulation(with no fed to inflate).
2) The supply is fixed at 21 million, but bitcoins themselves are not permanent. People die all the time without wills. People die with btc on a computer/flashdrive that no one knows about, they're gone. People don't make backups, their computer crashes, they're gone. You might think this is great, because now your btc are more valuable. But for a currency, it's not such a good thing, to have the supply eroding over time. Theoreticly, the amount of btc could eventually go to zero.
3) Speed of transactions. If btc becomes very widely adopted, can it handle billions of transactions a day without speed becoming an issue?
Don't get me wrong. I love bitcoin and the whole concept behind it. These are just questions of someone looking to learn more.
I don't understand people constantly bitching about potentially super rich early adopters, it's simple risk vs gain, they have put their time effort and money into this technology at the very beginning and they deserve every cent they got. There are dozens of alt-coins currently, how about YOU adopt them NOW at their early stage and take on the risk, so when they grow in value you will become "super rich".
So what? As private keys are lost all the other bitcoin are worth more, it is unlikely to ever be a problem decimal place wise and if one day all the owners of bitcoins are murdered the client can be modified to support even more decimal places without significant gain in transaction sizes.
Yes.
I swear it's like this board is filled with 14 year olds.