"It is she" is only used in the most formal of social contexts (unless used mockingly). Likewise, "I am taller than she." The conjunction, 'than', is used as a preposition: "I am taller than her."
Another feature I see disappearing is the use of the comparative in this example: "Which of you two is the taller?" Where the grammatically incorrect "Which of you two is the tallest?" is the preferred version in most social contexts, as the correct version is deemed too pedantic.
O tempora, o mores!
Duncan
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