I very much doubt it.
Besides, how would it even work? All the players wanting to steal are just going to camp outside houses till the respawn and then go in and clear it out. Unless you sit at the computer constantly, you'll be hard pressed to find a place that hasn't already been ransacked.
Plus, you'd have mobs of thieves rampaging through houses trying to grab the expensive stuff before anyone else.
If thievery is present, it would probably be restricted to instances and limited locations.
edit: Also lots of loose (And stealable) items tends to increase the amount of data being handled. Thats fine for a single player game, but an MMO can't afford to get chugged down with tracking cutlery and pieces of meat on tables.