2 Name: FindMuck !MrEff/SKhc : 2016-04-21 17:30 ID:KtvqpIbY [Del]
It's not the missions, it's the participants.
WCG, TFAC, FreeRice, and various petitions, all require little to no effort. They're also quick to get started for everyone here who obviously has the time and technology to participate.
I suggest you dig through the VAT and choose some threads to bump so you can reintroduce those kinds of missions.
This also isn't a mission of it's own so consider posting under suggestions next time you'd like to discuss changes within the community.
/sage