Where did you hear that rumour?
I do think that STN could sustain a small amount of long haul traffic. EK to DXB would be a good one and I can actually see something like UA to EWR working at STN as well.
It would be really good to see Emirates at Stansted, mainly as I'd love to see a direct link to Dubai. PIA tried it in the past but but I think the branding was the issue there. Plus, EK would do well for themselves to serve LHR, LGW and STN.
I have to say though, I'd still be suprised even if it did happen, but fingers crossed...