There is so much wrong with this post. We already practice a hybrid economic model and interestingly its failing. Completion is never a bad thing unless you are uncompetitive and refuse to do anything to fix the problem. What we will probably do is try to protect ourselves from this competition instead of adjusting to it and admit that any system of trade and voluntary exchange is governed by the desires and needs of those involved. If people even in your own country find what you bring to the table undesirable and not worth what you want in exchange for it you have a very serious problem on your hands that you better learn to deal with to survive in the market. A refusal to self reflect is not a problem with capitalism or voluntary exchange, but a problem of those that refuse to self reflect.
There isn't anything unrealistic about what libertarians believe or what they think will happen if what they say is followed. We do not promote that our ideas will bring you unconstrained happiness,or even promise you a wonderful life. We know freedom is hard, takes strength, and takes a strong sense of moral character to maintain. I find the power of the people is in their own hands and their own mind carried out through their own potential. I understand that society is nothing more than individuals and we must learn to treat it as our responsibility to make our lives what we want it be. Everything I believe is shaped around the idea that people should be free to what they desire shaped around the three basic pillars of rights life, liberty, and estate and I'm wise enough to understand what that calls for me to support in government. Capitalism is a logical conclusion for this foundation as it promotes freedom and prosperity like no other system that allows us to trade whatever we desire in exchange for whatever else we desire, be that our labor in exchange for money or anything else.
As for the topic, Marriage is a personal affair between two people that desire to share their live together that should be treated as such by those around them. If these individuals wish to involve themselves in contract than its the states job to enforce it, but that is it. It is a personal affair and is therefore personal, not a matter of government to dictate its terms, its benefits, and provide it tax breaks to promote it.