I don't believe Adobe will abandon professionals at all. Much of their Photoshop and Lightroom history has been specifically aimed at professionals, and they have actually tightened the relationship between PS and LR, even renaming LR to Photoshop Lightroom Classic. The new LR is aimed at photographers more concerned with sharing than composition and editing. LR Classic remains desktop centered with local storage options. Although it is feasible apparently to use the new LR with raw files, obviously as you point out, huge (and expensive) amounts of cloud storage and fast upload speeds are necessary to make this viable. Professional photographers would therefore prefer local storage and use PS-LR Classic, with more features. I don't see Adobe replacing the model any time soon, unless there are technological changes to bandwidth in the future.
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