Given that only handful ASIC sellers offering in-hand miners, most of them priced ROI to be infinity. Then it’s likely the network hash rate will reach the plateau at some point in time. It’s an indicator that miners are very reluctant to invest in mining equipment passing that point.
From this point on, the network will have some lengthy period of stability without significant hashing power increase. A government wants to destroy bitcoin, it’s easy enough to calculate the total hashing power needed to overtake 51%, and it can also execute overnight given that it’s highly possible to accumulate enough ASICs to flip on the switches at the same time. Miners won’t get enough time and resource to react.
Is this likely to happen?
In my opinion: If the goverment wants to get Bitcoin irrelevant, they can easily to it. Butterfly labs offers one GH/s miner for 10$. To get 3000 TH/h of mining power would cost "only" $30mio. Now let the goverment produce them in secret and way less efficient plus buy 5 very good programmers (for example to distribute this power , so no one will know that the goverment has +51%), ok, $200Mio.. The receipt of only the federal govervemt of the us is 3 000Billions per year, which makes $350Mio. per hour.
To get now more than 51% of the mining power the goverment has just to wait 30min to earn the money.
PPCoin makes it more interesting. To provide more the 51% of the mining power you also have to have 51% of all coins. This would be much more costly. Because if the goverment will buy this will just drive up the price and costs maybe multiple more than the market cap, which is now 10times more then the cost of 51% of the mining equipment.
Greetings