If you are joining with an eye to jumping onto a round the world trip; you are probably wasting your time.
For the FOs bidding it has now gone down to the younger generation shall we say, for at least the next 2 years i would say it will be full up with those currently already in the airline.
After that if it goes to the 73-8 or Max then it will go majorly senior again as many long termers on the fleet will be clamouring for a trip.