Were getting to the next hurdle in the bitcoin dialogue.
1) The network hash rate is increasing tremendously, and looking at all the major players coming to market by December/January, we are looking at another 10PH added in the next several months.
2) This is going to push the difficulty up as well.
3) As the network hash rate increases, the PPS rate is going to drop dramatically. Whereas a few months ago you could be pulling in a few BTC a day with 100GHs machines, you are lucky to pull in 0.1 now. What this is going to do is push smaller miners to other currencies and the rise of pools like multipool and middlecoin. This is going to create a situation where there are a lot of hashes being pulled from the BTC network, and the difficulty is going to level back off - however because the rate is too high for most small miners (anything less than 0.001% of the hashing pool), a lot of them are going to stay away.
4) There is going to be a rush to liquidate hashing hardware, reducing the pool further, and consolidating the "generators" to a smaller and smaller group.
5) As the other currencies start to become as acceptable, BTC is going to come into the sites of day traders and forex investors - allowing them to make money day trading while the market is still young. This influx is going to boost the price of BTC phenomenally.
6) Disruptive technologies are around the corner which are going to push the hash rate even higher. Only those with BTC reserves at this point will be able to purchase the new machines.
7) A new class of BTC elites will arise and the hashing battles ensue. Other Crypto Currencies will start to look a lot more attractive, and the pool will shrink again.
As we near the 1M block size limit, transactions are going to become more and more costly, so BTC to other currencies will replace straight BTC to BTC transactions. Intermediary currencies will start to see their valuation rise the same.
9) At this point, it becomes cyclical - fully mined crypto currencies become the "gold standard" and other currencies are simply orders of magnitude smaller. You might see a structure something like this.
BTC as the root gold standard -> LTC as an intermediary fund for scryptcoins -> Next 3-4 fully mined cryptocurrencies -> next 3-4 fully mined scryptcoins -> Intermediary transaction mechanisms
You'll also see the generation of OTU wallets with fixed amounts of BTC, and the conversion from digital trading currency into physical trading bits - verifiable via local tools. The need for a BTC encapsulation mechanism is going to arise - something that allows these physical BTC to maintain their value and not be counterfit nor copied - something like a RFID inside with a read only verification combined with a biometric database and bitbook...
But before we get there, we still need to mine the rest of the coins. And $55k per coin is a very, very low estimate in my appraisal.
However, there are a few things which could damper this.
1) Disruptive technologies which break the encryption of the BTC wallet keys
2) More undergound trading haulted by regulation
3) Regulation and governmental oversight (two way street)
4) Passing fad where investors and money leaves the market - remember, BTCs are only as valuable as they can be exchanged for tangible goods (or means to get tangible goods).
4) Internet explodes, WWIII, Zombie outbreak