I am going to answer in French, since it is easier for me.
The main challenge is investment, having the capital needed to start a business—Mathieu can add to my answer. When the time comes to transfer the business to other family members, parents usually give up a considerable part of its value so that the next generation can continue running it. The amount required to invest is a big obstacle. Business owners are in competition. For example, it is a serious challenge when a company wants to make investments, or rather, has extra cash, and starts competing with a young person who wants to go into business.
Mathieu might want to add something.