A company named BlueMaxima's Flashpoint purchased the flash version from Adobe in the hopes of keeping games that were built on the adobe platform and still use adobe flash running.
Even without it, all older browsers will still be able to use flash (NPAPI and PPAPI) long after 2020. It'll be a security issue more than anything else, but hopefully Flashpoint taking over will keep it running with patches and updates.
As for WGT..they may kill off the game client (to avoid paying for 3 platforms (steam, the 1st EA app, and Flash), but the wgt.com site will more than likely always be around.