Hello Cristian,
Please check out these articles to know more about SAP UX strategy.
https://uxexplorer.hana.ondemand.com/_item.html?id=18#!/facet/112
SAP User Interface Technologies - Road Map
https://experience.sap.com/pdf_designservices/SAP_UX_Strategy_and_Design_Services.pdf
I personally think that WD ABAP/FPM will still be used in a long run as currently, among all SAP UI technologies, it has the deepest integration with backend + web-based.
Hope it helps. Cheers!