Back in ARR? Or now?
Either way I've seen a few vote abandons in my years but I don't think I've ever seen or heard of a timer expire in a dungeon.
People adapt to the level that the content expects of them. You had to be vaguely competent or at least pay some attention to get through the likes of AK but in turn it taught you valuable mechanics that would return in the HM primals.
In modern Expertos, the challenge floor is basically not getting vote kicked. Anything above that and you're going to clear even if the tank has to solo half the dungeon on your behalf.
By all means feel free to provide links of people timing out dungeons though. If it's a genuine concern then I'm sure you'll have no shortage of PoVs, logs and whatnot for me++