Few people will mourn the loss of Flash. Try as they may, Adobe could never find a way to make it work on mobile devices without hogging the processor and consuming battery life. Apple's refusal to allow it on their devices was likely the nail in the coffin.
Interesting piece from AdAge.
"All it takes is cursory reading of the tea leaves to realize that within six months, every single one of the major desktop browsers will have stopped natively supporting Flash -- regardless of whether the advertising world is ready for them to do so."