If you are still working on the traditional, rigid ABAP development within the core, you will face huge dependencies. Also you will have very limited flexibility to innovate, challenges with keeping the core clean and adapt to fast-changing market conditions. Without innovation, you simply can’t increase your productivity and revenue.
Your TCO will increase even further, while your SAP landscape becomes completely fragmented and low-governed. This causes many application dependencies and makes it impossible to react quickly to fast-changing market conditions. It will also be very difficult to innovate or automate the current business processes. Your revenue will continue to decrease due to the lack of innovation power.