It's a very good idea.
The worst things about a business aspect is to add makeup to fake the truth. The negative list you mentioned are the real pain every startup will face as well as well established businesses at some points. The difference between startups and well established businesses in this regard is that the second can hire coaches to solve such problems. I assume that your platform can create an intermediary way to offer businesses at any level the solution they need for the problems they face.

Identifying the real pain is the first step toward success. Therefore, you are not teaching entrepreneurs how to be stressed but you're giving them solutions to reduce stress.

I think the idea would be very helpful if you offer phone coaching or skype beside articles and videos.... Entrepreneurs are very busy people, and it's hard for them to spend time in reading documents only. Sometimes they need immediate help (reading will not be an option for them).
Entrepreneurs like to measure progress, for that you need to offer them outcome measurements for the progress of their efforts on your platform.
Later on it's better that your platform connects mentors in those fields and potential entrepreneurs who are in need of such services.
We live in a very fast paste entrepreneurship environment. Entrepreneurs are more willing to participate in platforms that give them higher results in a short time period. For instance if you offer video coaching make them short and toward the point. A great video coaching you can find on youtube is for "Evan Carmichael". They are short, follow three points solution pattern and toward the point (the longest one is 5-7mn length). If you need longer time divide your videos into steps solution.

Remember that entrepreneurship becomes a lifestyle in business and careers. Today, Companies tend to hire employees with entrepreneurs skills and not old fashion employees. You services are ideal for business owner as well as for their employees.

Happy to talk to you in more details by phone.