Making money with software is not very correlated with said software's quality - or popularity. I think yours is an unanswerable question, you should probably start from the other side of the equation (i.e. what's the target marget? who would be willing to pay for the software? and, given that we are talking about open source, what would you sell - and to whom - to beat the possibility to just use it? What would the licensing options for commercial usage look like?).