Are you able to add 3-5 customers per month at the 25/mo level? If so there's a chance. If that many customers are signing up with just you and minimal marketing, you could probably 10x that with channel partners, then start working towards an enterprise version or additional marketing.

Another signal would be that you are able to successfully add a co-founder.

If it takes more than 6mo of post-launch to those milestones, I'd give up on the idea. Market's probably saturated or you're not solving a pain point.

Things only get more stressful. I'd work on backup plans or some job searching during those six months. Its nice to do the job search when the side project gets too much and vice versa. Also, it can be a nice side project if you re-enter the workforce.

Source: bootstrapped a SaaS company to several million in revenue.

Thank you for the numbers, that's very helpful.