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1. The average CPU can do 1-10 MILLION hashes per second. So an ASIC is only a million times better. But anyway you cannot compare a general purpose CPU to an ASIC. It is still same generation hardware. Computers did not get a million times better in 6 years.
2. A hashing ASIC cannot do private key checks.
3. I don't think you understood the text around the picture

4. Keep calm and don't worry about brute force.
5. If it were possible it would already be done. It takes a smart guy to make an ASIC and they all know a private key brute force is not worth the effort

1. So the average CPU is able to generate 1-10 MILLION Mining hashes per second, is this the same rate for Private Key generations?
2. Good.
3. Maybe not.
4. I don't like to keep calm.
5. Are you aware that in the 80s the cyber gurus at the time got to the conclusion that it wouldn't be possible to generate a crypto based money? Look what came up 30 years later...

Read about Cypherpunks...
So don't expect that the unthinkable won't happen one day.