I felt a similar betrayal that this author felt when Adobe started to drop support for Flash, stopping any development. Their claim of supporting every device with AIR went south not by dropping AIR support (which happened when they stopped Linux support), but by not developing the Flash platform as new devices and OSes poured into the markets. I have since successfully moved on, but I did feel weary for more than a year, unsure where I was heading.

Consider this a mistake, and learn from it: don't depend on any vendor's altruism, always look to diversify your knowledge and options, avoid vendor lock-in at all costs. I believe Apple will be a much bigger drama when this happens.