Hey, who knows, maybe they will do that. It's just as valid a prediction as any of the other doomsday scenarios everyone is acting like will 100% most definitely happen. I'd like to know too, it would be kinda nice, but they've basically priced the game at $40 for the content as is, not as a f2p platform that everyone is still thinking about it as.
Everyone compares this to TF2 so I'll make one. When TF2 came out the whole internet wasn't sitting around stroking their chins over what the content plan for TF2 was, or how it would be delivered, or how/if it was priced. It was "This is TF2. This is how much it costs. Have fun, we'll see what happens." And it worked out fine.