Appears to me that World don't want to errode current T&Cs, but want to grow the airline using another airline they own with lower pilot costs. Whats the issue? Everyone keeps the T&Cs they are used to and they appear protected for the future, meanwhile the airline grows and pilots in the 'other' airline benifit from promotions etc (and I presume they are happy with this). OK a FO with World is mising an oppotunity, but if they cost more than someone else then thats life - supply and demand. When the 'pilot shortage' comes they will be able to advantage - just like the rest of the other airline employees.
If World have the balls then all the jobs could be moved to the 'other' airline and a drop in all pilot costs, but they haven't done that yet - I guess the strike may force them into this, then only the World pilots loose and everyone else is happy.
Wake up and smell the roses..........