The scary part is when parents who just need a consumption device only buy a tablet. How many of you would've been able to program at a young age if your parents didn't buy the family PC.
Having a computer makes programming more convenient and less theoretical (bugs happen occasionally despite correct code), but it's not essential to learning. It's a lot less likely to happen in that way in the current environment (with ubiquitous PCs), but if we ever get to the point where PCs (or their equivalent) aren't everywhere anymore, the interested geeks will find a way -- just like we did in the old days.