Looked into this commercially a few years ago when I was working in the coffee industry with the idea to manufacture pods when the Nespresso market opened up.
Commercially it has very little to do with the coffee and everything to do with marketing and the spin you can produce around each flavour of capsule. As long as you produce a decent crema then you will be fine as any pre ground coffee regardless of whether it is in a capsule loses all of its depth.
There is definitely a business there but dont loses focus on things like recycling as this is most definitely the wrong system for people who are enviro conscious in the first place.
Also if you are serious visit http://www.triestespresso.it/ or http://coteca-hamburg.com/en/homepage/ next year where you can go direct to supplier and even look at capsule producing machines if you want to go all in!!