Do *that* all over again?
Presumably, like all ERP integrations, making their existing stuff work properly took years more than expected and cost much money and pain.
Now it's stable enough to just get on with their lives.
And SAP want companies to upgrade because "new shiny!" - and because SAP needs the money?
I can see that not aligning with many business plans!
I wonder if there is a legal route to force SAP to maintain the functionality of the product that companies bought. Otherwise, said customers may well be better looking elsewhere.