They may last a little bit longer than that, but since many people have been saying since the early 1990s that OODBMS would replace RDBMS "real soon now" and no OODBMS vendor has ever gained any significant market share whatsoever, it is hard to see what is different about Workday in this context.
Of course SQL-DBMSs are not inflexible at all, making changes is easy, it's changing all the application code sitting on top of it that is hard. There are steps you can take to ease this pain but going OO is not one of them (often quite the opposite in fact).
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