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.
This is an innovator's dilemma situation, where the incumbent technology (PCs) are delivering far more value than some users need. As such, "worse" technology (tablets, phones) are acceptable replacements for PCs for some of those users.
To you, that extra value is important, but many people just want Facebook, Email, Internet, etc. Those people are often totally happy with a device like an iPad that doesn't have as much overhead or complexity.
This is an innovator's dilemma situation, where the incumbent technology (PCs) are delivering far more value than some users need. As such, "worse" technology (tablets, phones) are acceptable replacements for PCs for some of those users.
To you, that extra value is important, but many people just want Facebook, Email, Internet, etc. Those people are often totally happy with a device like an iPad that doesn't have as much overhead or complexity.