Over here in France they've been doing it (Chip 'n' Pin that is) for years, without any major hassles. When we first got here, all I had was a credit card (which had a chip on it) which everyone tried to put into the reader, and didn't know what to do when the machine said "swipe" (in French of course!) Most times I didn't sign anything, they just handed the receipt back to me without any verification. On the motorways, the toll booths are set up so that they take cards with using the PIN. Presumably they have an arrangment to take the hits, and the losses must be low enough to compensate for the time factor (and hence the possibility of massive queues)
Stuart