CONCLUSION
Alot of people today blame themselves for what they have failed to do some years ago. The idea you failed to develop year ago may be the success story of another person that turn him/her to a rich person. Life is just about risk. Risk that money in your account into your ideas without minding what people will say, put in all your possible best for the idea to become successful and become a successful entrepreneur rather than a dreamer.
You have provided many explanations of facts and I very much agree. But this question will turn to you before others judge themselves for failing. I mean the question you will receive from other people is how far have you achieved success? and what is the ideal implementation that you can give us? or in the end you also only theorize while in reality you never start at all.
In the business world, building everything requires cooperation and complementing each other. Having an idea and being supported by the resource elements to achieve it will be easier. The idea will be considered successful if mutual cooperation between the idea owner and the executor in the field is built.