It would have been easier for me to quote you if your answers were in your post, but I'll do it anyway
1) Possible, yes, but unlikely when looking at the past. Besides, we'll probably stay on the "moar DPS" mentality for a while now, so anything is better than Parry.
2) We don't know yet how this will work. I really hope they don't use the same gimmick.
3) Getting the next tome weapon will probably be shorter, but will still requires you to keep your tomestone of whatever and thus, not buying armor with it...while still being, at best, on par with the Anima.
4) Yes, it was funny, but frankly, the gear you have for your leveling phase does not justify min-maxing.
No, I'm not mistaken :
In regards to weapons, we removed accuracy from the weapons for all jobs. We did this to eliminate situations where you couldn't use a new weapon with a high item level because it didn't have accuracy on it. We've made adjustments to the required accuracy, so even without accuracy on weapons it should be easier to land hits on enemies.
Taken from the Q/A thread on Live Letter XXIII.
Nope, because in 3.3, we'll have the next step of Anima to make it an i240 weapon (or even i245, if they follow the Relic steps), probably with custom stats so that your Augmented Hellfire will always be weaker.