While I can see the attractive part of having more people in zones, the whole leveling mining / herbalism part of it sucks.
Have you thought about this when you went through with the design Blizz?
Trying to level mining on my alt today, and after 30 mins of flying around Borean Tundra I found exactly 4 Cobalt Deposits.... That means by this tempo it will take me 562.5 minutes or 9.375 hours to level from 375 to 450. Sounds fun on something you already have leveled on other chars right?
And this is only due to CRZ, it was not a problem before it got introduced.
Why penalize alts even more than you already have done with dailies? Do you want everyone to level the crafting profs? The gathering profs already the worst when it comes to classbenefits.