Aristari, Verain and I were theorizing how the cooldown reduction stat could work - and we concluded the only way they could really pull it off fairly would be for it to scale like mastery* - having different %'s for different specs. Readiness would have to apply only to baseline spells - so it couldn't apply to Power Infusion because it would benefit power infusion over DI or ToF - with any amount of base readiness - that's just awkward for the talent choices.
Similarly how it would interact with Mindbender is troubling - since Mindbender is a Shadowfiend replacement talent, it should scale if Shadowfiend does - but since it would benefit Mindbender but not FDCL and Insanity - it would break the tier choice. To make a CDR stat valuable to Shadow, where it would only benefit Shadowfiend - it would have to be massive - Shadowfiend is such a tiny % of our damage, that Shadow would need to gain like 80% CDR for the same readiness rating that a hunter would gain for like 15% CDR (because they have so many cooldown buttons).
Overall, I don't feel they are going to go live with the Readiness stat - even when they toyed with the idea through the CDR reduction trinkets in SoO - they found it super problematic balancing it - particularly for casters - and particularly for Shadow amongst casters - so casters didnt even get a CDR trinket.
Personally I think the solution is to just make different stats good for different classes - and stop trying to make every spec care about every stat equally - Readiness could be good for hunters and terrible for Spriests. Haste could be amazing for Spriests and terrible for hunters - and rather than Blizzard going to Defcon 1 and nerfing Spriests - they could just call that 'fair enough'.
I agree it sucks when an item drops and is covered in stats that nobody cares about - but the best solution to fix that IMO is to allow greater reforge customization.
ie. 100% of one stat - so that a spirit / haste item isn't 'bad' when we're above hit cap - because we can just make that spirit into crit or mastery - but haste/crit is better because it's more flexible - it's haste/crit when we want that, it's spirit/crit if we go disc for a fight, etc
Edit: sorry I was just rereading the thread and noticed I wrote haste at the start where it says mastery* now, I meant mastery - my mistake ><