As a developer I'm sure you enjoy it, everyone has some obscure niches, but what about the users? Why do WE have to suffer? To the users, flash is dead.
It might not be slow in execution speed when doing some arithmetic, but flash is the only thing we really hate having to run on ANY device. Firefox, Symbian, Android, Maemo, Chrome, Windows, Linux, you name it, flash will crash it. (several times a day, and/or make it painful on each execution.).
The ONLY situations where a user will run flash instead of an alternative is when the user is either a) A computer beginner and can't tell the difference between slowdowns and a virus, b) There is no alternative non-flash app, and c) It doesn't say anywhere it is flash, before purchase. Almost any competent computer user that knows what flash is will try to avoid.
Even Adobe has given up on the flash runtime, and is neglecting it as evident by the snail-paced progress in fixing a few bugs here and there every few years.