I have to disagree with you. Free-To-Play is the ultimate DRM. Your game only exists as long as that game cloud is running. As soon as it becomes unprofitable, they'll pull the plug in a heartbeat. Just like that, your game is gone.
From the publisher's point of view, this is the best possible solution. Turn everything into MMORPG, MMORTS, or MMOFPS and start raking in the dough. As soon as v2 comes out, pull the plug on v1. Or better yet, make expansion1 that makes those playing the vanilla version lose every time. I can see more powerful guns in FPS-type games (like the Double-Barrel shotgun in Doom2), more powerful units in RTS games (like Krogoth in Total Annihilation:Core Contingency), and Monty-Haul Loot Drops (TM) in MMORPGs (like Dust of Disappearance in Curse of the Azure Bonds - that stuff rocked!)
Point is - I can still play Curse of the Azure Bonds more than 20 years after it was made. Yes, I still have a floppy drive in my computer, and an emulator is required. The Free-To-Plays will probably last 5, perhaps 15 if they are a runaway success. Future generations may not have access to them. Now where did that Adventurer's Journal run off to, I need to read Entry 37.