I suppose the difficult part is figuring when you've crossed the fine line from "good enough for now" to "this is becoming a monstrosity, we need to hire developers and create our own software now"
The second difficult part is when the team that built the "good enough for now" realizes that the line was crossed, that they do not have the skills to be part of the "hire developers and create our own software now" solution and then start subtly, or even openly, sabotaging every effort to move away from the Excel/VBA solution.
