No.
1. Unlimited farming resource makes gateway for another economy collapse
2. With the current ways you can get enough pe and recraft stones
3. Get a life, go outside, help an animal shelter
4. If the instance is too quick, people with absolutely no lives will spam it thus deepen the already existing gap between hobby player and nolife-hc-gamers.
IF
the instance is long enough and hard enough (like FF/FC was for lvl 80-85 rainbow squads), 2 hours or so, people would have less motivation and more planning to do in order to get what they want. (I miss brainwork from gameplay, nowadays it's only repetitive hack-and-slash with FSP a miniature exception)
I'd like to hear other opinions though, this idea is something we can start a discussion with.