> Will I have the grit and the passion to pursue one topic for the next 5-7 years.

I will say, I was able to get my company off the ground and white labeled it for a much larger company. I ended up hating the product in the end, 10 years later - because I was sole founder and every single thing I had to do myself.

I think you will be able to stick with it ( especially when there is no other choice ! ) , but you might end up hating it.