Oh please, please stop this BS. The iPad sales are shooting up, true. The PC sales are going down, maybe true. But that could be due to several reasons - Maybe consumers are just 'upgrading' (like RAM, HDD, etc.) their existing PC's, or maybe existing PC owners don't want to even upgrade their PC at all because it's still working fine, there just could be a lot of reasons.
The statement that just the iPad alone eats the PC market is like saying, KFC is killing Ford's sales because it sells more chicken. Makes no sense, does it? Exactly, that's what the iPad vs PC comparison looks like too.
NO consumer would want to replace a PC with an iPad because there is a LOT of utility attached with a PC that it would be a blunder to replace it with a tablet like an iPad.