Rigid ABAP development within the core is causing huge dependencies and very limited flexibility to innovate and adapt to fast-changing market conditions.
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.