Technology aside, will travelers care about Hopper if they ever see a product after six years of development? If you have patience in excess, then stay tuned.
Hopper is doing heavy lifting in amassing data to spur travel inspiration. Five years in the making already, it needs to deliver out of the gate, or become an expensive road kill.
Destination discovery/planning tool is a startup minefield & few have cracked it. Hopper's goal of using Big Data to catalogue travel flight and destination data is ambitious & admirable, though they're taken a lot of time and money for it.