Ehealth was the first to launch a long roadmap during short roadmap season of ico project. Now most are coming up with long roadmap upto 2020 ..
Short roadmap season
season of bull run and season of bear . Market trends and season ..
At least a long roadmap can withstand several seasons
It will definitely increase the sustainability of the project compared to shorter roadmaps. Most of the coins get crushed these days because of the market.
I remember how most roadmaps of Airdrop projects looked like. It was like 1) airdrop 2) exchange 3) website. Completed after one week and then nothing. They are all dead now.