Let us step back and think about this with relevant evidence.

Both systems work, both systems work well.

Under specific conditions.

So... before we move on...

Do you have any examples of a formerly P2P exclusive MMORPG that added a F2P feature and isn't now bleeding subscriptions?

It would be good to have a model of how this will affect the game under those conditions rather than comparing apples (Eve) to oranges (FFXIV).