Comment by matt_s

I could see where a startup can solve one of these slices in SaaS form with the intent that it could be also sold as installable via containers on premise or in a private cloud for a customer.

Then do the same for another slice, offer it to existing customers and make the completed slices work well together. Then another slice.

And along the way there could be profit to fund the next slice, as well as existing customers you can tap into to solve their problems. It would be simpler to niche down vs. the SAP/Oracle path of ERP-fits-all.