capitalism is great for things that everyone does not need. so in other words things that they can choose to have or not to have. In addition there needs to be real and significant competition which is inefficient when you talk infrastructure (so for utilities you would need multiple electric systems and multiple gas hookups and such). Lastly you need to regulate them from doing anything untoward and taxes have to be collected to not allow massive wealth disparities. There may be some future superior system but I sorta doubt it. I could see it getting to the point of not being much of a thing for the average person (a la star trek were at an individual level because of replicators it does not mean much but like between planets and species and just on the frontier you still have it.)