[bestan]

Yes, it is definitely realistic. We've seen several projects like Sidekiq (http://sidekiq.org/) that did it.

Another quantitative indicator you can use is number of downloads on relevant package manager (npm, PyPi etc.). These indicators only tell you how big your audience is and not whether your project could provide income. However, having big audience increase chances of success - you have a good position here.

Check out MinoHubs (https://www.minohubs.com). We provide tools that will help you get started with monetizing your project in several ways very quickly. Let us know if you have any questions or if you're missing anything.