Anything's possible. But the vendor can increase price or refuse a discount instantly. While that government client would require a years-long large and costly

Anything's possible. But the vendor can increase price or refuse a discount instantly. While that government client would require a years-long large and costly project to migrate - and their track record on completing such projects is terrible. They might be able to run new projects on different vendors but it's not likely they will ever completely migrate existing applications.