Hi Nightwalker
Damn straight. Most niche SaaS products began as glimmer in someone's eye, whether it be a developer or a product manager or what. Eventually you may find that there are only so many hours in the day and you have to scale your business. The emails themselves will do you in. Not to mention that if you hire or partner with people who have backgrounds parallel to your own, you'll cover more ground. But keeping lean at the start is smart, you'll be able to adapt quickly that way. Just be sure you have some people you can at least bounce ideas off of, you need sanity checks now and again.
Good luck!