2 Things.
1. If you already work for one of the better paying airlines you will not get more cash cause there is a so called shortage. Airlines like CX do not have a lack of applicants - if they are short in crew its due to bad planning. The shortage exists down the line with the smaller companies that don't pay and therefore lose guys. So if you work for Phillipine Airlines you might be in for a payrise. If you work for CX there's nothing that prevents them from giving you a paycut - and still get all the Filipino Pilots to apply.... ( this is an example only )
2. Pilot shortages will eventually be eradicated by huge cadet schemes. These cadets will be signed up for cheap long contracts and will fill all the slots in future. Ie. once again it will do nothing to improve your conditions cause a local cadet with a big bond/low starting salary/no housing and education allowance will cost the company a lot less over a 25 year career than an expat ever will.
So dream on if you think a pilot shortage will help you if you already work for a major well paying company.