Yeah similar points were brought up in Revelation Space books - You basically spam missiles at incredible ranges with the theory that one hit is plenty to effectively remove the enemy from combat.
In something like the Antares trilogy (really good set of books, look it up), both sides typically end up flying at each other, with less than a minute of actual combat range until they pass each other. Some lasers were used, but basically only at melee distance were they actually relevant.
Honestly though, I cant really agree that laser systems would require so much energy they would be fixed. If we are imaging that we are flying through space(something we cant do yet) can we not also propose that we can create powerplants or more efficient lasers, in such a way that will allow us to create turreted energy weapons?
If I am not mistaken, the USAF attempted to create a strategic warhead interception aircraft, the YAL-1, which would intercept and destroy (through puncturing fuel/hull of missile). it seemed to perform well enough in trials, and most importantly - It had a rotating turret on the front. Theory would state, I believe, that even if we could not create powerplants able to move with the laser, we might be able to funnel he laser's energy into a mirrored contraption, allowing us to shoot in any direction anyway.
http://en.wikipedia.org/wiki/YAL-1And a final point - I believe projectile weapons are incredibly underrepresented in this discussion.
Sir Issac Newton is pretty scary, after all. I mean they suffer from similar problems as your average laser, but at knife fight ranges where you couldnt dodge a laser, its pretty likely you also couldnt dodge a railgun or coilgun. Or hell, just a conventional gun.
Sure, missiles will be overall safer, but we could probably leave lasers to point defense and throw projectiles at each other if we got in close enough.