@bcpokey
Good follow up to my statement. Those are very good points.
Absolutely the speed of reinvestment will diminish assuming BTC revenue is reinvested.
But there maybe new investment money coming online.
If you assume the same last six months of difficulty increase percentage wise ( 0.2% to 0.6% per day) I still think 6-12 months post pre delivery shipment completion(8-12weeks to get those things out the door) we will see 500THs. So say 7-15months after first delivery. That's where my numbers come from.
If you would wager a guess at when we would hit 500THs what would it be?
I prefer to just shoot down other peoples ideas because then it's harder to throw back in my face :p
But seriously, it is quite difficult to guess with change in tech and whatnot, so I will say that as a tentative estimate, I'm foreseeing a fast run up to 250TH, by end of Jan, then a steep decline in the rate of new power coming online. The next 250TH I'm guessing will come online over the course of 10-12 months depending on a few factors.
1) Price (up or down?); up boosts the curve, especially if we see an increase RIGHT after 25 halving. Even $15/coin would shoot up the rate at which ASICs are acquired
2) How fast ASIC 2.0 is released and/or if there are price drops on ASIC 1.0 in this time frame.
3) How quickly supply can meet demand divided amongst the suppliers
4) If suppy > demand by a significant amount, if a supplier decides that mining excess unsold hardware makes sense.
5) Reserved
BUT, assuming reasonable price level close to current ones, ASIC 1.0 being the only game in town for 2013, a reasonable rollout of supply, and no malicious suppliers, my best bet would that we hit 500TH around the end of 2013, if not later. For why, as I said, the initial burst of pre-orders will be the main thrust into ASICs, which will explode difficulty, late comers will be eyeballing price/difficulty/reliabilty, etc. and take a slower tack to buying. 500TH is roughly 8333 singles or ~10.25Million USD, close to the current amount of GPU hardware, which I think will take current users time to liquidate their GPU rigs, and decide if it's worth going into ASICs or buying coins.