every week for the past month, btc value has been falling by $10US, and extrapolating it to the next few weeks gives me the following;
July 10 -- $70
July 17 -- $60
July 24 -- $50
,
,
,
August 21 -- $10
Once the $10 firewall is breeched, the race to $2 will happen in a few days.
Thus, by the end of August 2013, it will be $2 or less.
PS: I am neither an expert nor a psychic. Think of me as a devils advocate.
I agree with your analysis as I came up with $2 as well. However the one thing I think you are missing is increasing difficulty of mining which sets the bottom price higher. Yes ASIC is driving price to that floor, but it is also driving difficulty up at the same time.
Right now I have them converging at $20, but it doesn't matter it will be easy to calculate when it gets there... whatever price it is. That is when to buy.
Better yet I am thinking of purchasing whatever the most efficient miner is at that time (assuming it can be shipped immediately) and either buying or mining based on the KW/GH ratio advantage at any given time.