EK could be a very strong contender as creating more fifth freedom routes through Europe is on the agenda, with MAN apparently being looked at. If anything ever does happen, then it looks like JFK is perhaps more probable.
Outside of LHR, there is no daily all year schedule to YYZ and if diplomatic relations between Canada and the UAE had remained a little calmer, I suspect that YYZ would be worthy of a little more consideration. However, that is extremely unlikely for the foreseeable future.