Long ago I loved to fish so much that I went through a couple of college degrees in fisheries, fishing all the while. Once I graduated I got a job in fisheries, and in short order I quit fishing altogether. It simply wasn't fun to work all day, then play in the same venue. It took several years to rediscover my love of fishing, and it was a long process to learn the distinction between work and fun. Now, even after a full career in fisheries, I still love fishing.
Somewhere along the way I also fell in love with photography and become a serious amateur, then part-time pro. Upon retirement from fisheries I became a full-time pro photographer. Having been through the whole cycle once already, I have not lost my love of photography while going pro, but it took my prior experience and a lot of thoughtful effort to prevent that from happening.
Whether attempting to become a pro is a good answer for you involves a lot of really personal variables, and whether or not you can do it in 5 years involves even more, including local demographics and your willingness to market yourself and your work.
If it were me I would accept the 5 years as a providential gift that would allow me to pursue a dream, but I think I would know the answers to the questions long before the time span expired. In your shoes I would give it your best, but I would also be prepared to pursue another course if it didn't work out, either financially or personally.
Frank talk, but you will have to come up with your own answers based upon a serious study of yourself and the local variables.