Lets get some commonsense going here .
Of course young captains with the low-costs are going to jump ship and accept RHS with Emirates . They know they cannot face 30 years plus flying RYR . A few years RHS learning the ropes of longhaul , nightflights , monsoons , crap ATC etc while working for arguably the worlds most successful airline , is a small price to pay . By the time they are 40 they will have 'made it' for the 2nd time and left behind those fortunate enough to have got into BA / VS etc .
As for Ryanair , they will still be providing young wannabees with the chance to get into jets , and will have many of their current crop approaching command status .
The door may revolve a bit faster , training costs may escalate somewhat , but Ryanair will never run out of crew.