I see no way VR is going to make any foothold in 1) most strategy games, both real time and turn based, 2) small time-wasters (usually Flash based) and 3) basically any other game which doesn't have a 1st person view or doesn't use it as default (that includes most MMORPGs).
Via interface changes. Sure, you couldn't simply port WoW to VR and have it work very well. Boss fights are designed assuming you have a full view of the map. Being stuck in first person view and not able to zoom in and out, etc would make it terribly difficult to play. How would you activate abilities? How immersion breaking would it be to see cooldowns expiring? It would be awkward sitting and waiting, watching the auto attack happen without you doing anything. The "slash the air near the target" visuals would seem very odd in a realistic first person view. There are all sorts of problems. The game, both interface and major assumptions about gameplay itself, would all need to change.
But that same thing happened with mice. Mice changed interfaces and assumptions made about gameplay. We don't use a mouse to push letters. Look at games in the elder scrolls series. The mouse button isn't simply a key. You can slash in a direction to control the angle and type of attack. That's something a keyboard is incapable of doing. Changes of this sort will be needed to make VR games, yes. But that doesn't mean the games can't be made.
most strategy games, both real time and turn based
Simple. Use something more like a touchscreen interface. Imagine having an adjustable top view of the battlefield. You have no body, only hands. You can reach out and slide your hands to slide the map, and you can put out both hands and bring your hands together or apart to zoom in and out. By touching units you can select them, and by sliding your fingers after touching unit you can make it move and set waypoints for it. By
speaking you can set control groups. And remember you have two hands. So, touch a group with your left hand and slide to a point to set that group to move while simultaneously with your right index finger you selectively draw a circle around specific units in a nearby pile, and then slide that group to the same point, then say "set group 1." Now, at any point you can say "group 1" at target a point with your finger to set them in motion.
While you're at it, there are all sorts of interesting things you could do with the interface. For example, you could set the game inside a command post with you as the commander in charge, complete with a row of screens and several officers under your command. You, the commander, are observing the faraway battle from your post and issuing orders remotely. You can set the various displays to first [person camera views from your soldiers on the field as well as aeriel views via orbital satellites. Or you could try something totally different. Imagine, for example, the previous "no body" interface described above, except that instead of taking place over a flat map, the battle takes place
inside a sphere. No need for a radar map. You can very easily both see and target anywhere on the entire battlefield.
Strategy games can very easily be accommodated by VR.
Mouse is useful because it gives you precision of a hand movement with minimal exhaustion - because your hand is constantly resting. Keyboard, on the other hand, gives you universality of words. VR is basically a Power Glove - something which looks extremely cool to use, but it's actually pretty crappy in long-term use.
At one time, many people thought mice were ridiculous.