Those are not issues that come with turn-based gameplay. Load times in general can be removed, and random encounters aren't a necessity anymore. You can still streamline and optimize a turn-based battle system for modern times, be inventive with how it plays. There's a hole there that Final Fantasy can easily fill. If people want Skyrim, they'll play Skyrim. If they want Final Fantasy, they want something different.
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the dreamer of improbable dreams