For anyone coming in now as a DEC, I hope that you check out the requirements as they are now, and meet them. .
These requirements now are:-
1) A minimum of 10,000 hours Total Time prior to joining Emirates.
2) A minimum of 4,000 hours Hard Time.
3) A minimum of 3,000 hours Command Experience on EK aircraft type or minimum of 1,500 hours on EK aircraft type and 1,500 on a commercial aircraft with MTOW greater than 55 tonne, and current within 12 months before joining Emirates and holding a valid type and instrument rating.
4) Preference will be given to type rated A330/A340/A380 or B777 & instructors.
5) Valid ICAO ATPL.
6) Must join before 56th birthday.
The above is posted merely for information. I don't know if they will hold you to it if you already have an offer, but I would make very sure that the rug is not pulled out from under your feet when you get here.