Hello everyone, SUV-members,
I am an Alumi member here, who applied PR under this stream from mid 2020 and got PR on early 2023, and have been granted citizenship recently. it can say, my family was settled down quite well in this new country after 3 years. Because of an injury, I was approved for 7days off from my company, so I have a chance to come back to this forum, which brings back to me all old-unforgetable-memories when I was at your situation. And now please accept me to share some of my thoughts from my POV. 
First of all, I feel so sorry about the insane of processing timeline, 10+ years. From my perspective, it is another way of shutting down the program because no business is considered a start-up in the 10y term length; even 3y or 5y is also inappropriate. In short, within these very long years, if you do nothing for the startup (just wait for the PR granted then start), IRCC will refuse your application because of the stupid famous reason: "you have no serious intention, or are not dedicated to starting a startup in Canada". And what if you do? Well, 5y or 10y giving up your current career, current job for a vague start up, cost a lot of money, time, hope, and chances; in return for a right to stay and run business in a not-home country(!!!), is gonna make us look like a fool more than an entrepreneur. 
Second, most of us here have thought that PR is the destination, but actually it is just the starting point for a journey full of difficulties and challenges in another country ahead. That challenge can come at an extremely high cost, that we couldnot pay for, or also the sweet rewards if we overcome. And there is a bitter truth that Canada is not a paradise for everyone. I have seen many suv families (most of them are wealthy families in their host country) came here and then left because they could not associate with the social here. It wasn't simply just leaving, they had previously suffered countless wounds and disappointments. Is this worth it? 
From my sincerity, I am not saying that you should give up, but I want you to consider and prepare carefully for your situation. I know that each of us has good reasons why we decide to settle in another country, but please remember that Canada can solve your current problems, but at the same time it will also create new problems that you can never imagine. So please consider it. And finally I want to say all the hard work pays off. Stay strong everyone. Good luck.