Bitcoin inflation in 9/12 doesn't seem to have been corrected. Why not and will it be fixed?
A short term increase in the gradient on the graph can be caused by a large and fast relative increase in hashing speed of the total network. Within a short time, the difficulty adjusts and prevents it having a substantial long term impact. The steep gradient on this difficulty graph between 13GH/s and around 20GH/s is an increase of around 50% in hashpower in a very short time.
It won't be fixed, because it's not broken; it's working as originally intended. It does mean that the date the reward adjustment is halved comes slightly earlier than if the network hash rate remained constant. It also means that as the value of bitcoins grows higher, more hardware will be purchased and added to the network, and blocks will be produced slightly faster than the 10 minute average.
The final date of &quot;new bitcoin mining&quot; is of little consequence. Well before that date, miners will be earning more from transaction fees than from the block reward.
We can expect more of this when ASIC mining hardware comes online.