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They are here to stay.
Being one person who has been overseas many times and these units are common, they also have a bigger selection and more features that we have not seen yet.
The incorporation of recirc connection built in, multiple sequencing capability with just a field cord and many other features make them the choice in many applications. Sure retrofits will still lag due to gas capacity requirements but, watch for them to become the norm on new installs residential & commercial.
Just around the corner will be a dual certified (DHW/Heating) condensing unit vented with PVC. Although this unit will be limited to low temps (max-140) due to venting, the price point being much lower will make many rethink their application once Cat III venting is not required.