The two to three years quoted to Command at EK was based on previous command experience, i.e going LHS to LHS at QR v LHS to RHS at EK.
You are correct that if you have lost your job elsewhere due to an airline going bust and QR make it quick and easy to join in the LHS fine but if you get the choice of EK RHS (particularly B777) or QR LHS (A320) then think about your long term ME future carefully as there are so many reasons that EK may be better if you plan to stick around for more that 5 years.