Regardless of whether you think it should have one, they didn't exclude it because they couldn't figure out how. They didn't want to sacrifice the design (internally or externally). While I don't mind that decision, I understand why that does turn many people away from the device.
It was sarcasm. I gave examples of what they've been able to integrate into smaller and more internally dense devices, like the iphone, to demonstrate that they do know how and could have integrated this. So, explain to me how they've managed to fit 2 cameras, an LED flash, an accelerometer, magnetometer, speaker, mic, headphone jack, battery, wireless communication chip sets, ambient light sensors, logic board, LCD screen, and a 30-pin port into the iphone, but some how something as simple as a card reading slot would "sacrifice the design," on an essentially giant iPhone? They've even managed to add 3G chipsets to the iPad, so I'm sure that that real estate could've been used for a port of some sort on the wi-fi only models.
You tell me, but I see a lot more equipment packed into that iPhone than I see inside that iPad.