I can say from professional developer point of view - as in one that was paid to make flash games for living - they are already dead unless you can find lucrative contract work and having guaranteed money.
Everyone is just ejecting himself from the system - a lot of folks I know are moving to html5. Some did it earlier, wish I thought about it too.
Problem is it was relatively easy for people gambling month of their lifetime to earn 5k+ earlier. Heck my friend managed few times to get 12k+ from flash games.
But right now its only reserved for top tier games, and those are not taking a month but more like 2 or 3 so profitability is lowering while sponsors requirements are raising.
Overall whole market is imploding there. Its not like flash games will die fast, but expect less higher quality games in future because people loose interest when they cant make money to make living out of it.