Language learners need the facts — not politically correct theory. There is good reason to believe that uptalk is not a regional variation or “language change”. It is (depending on the case) a bad habit, an affectation, or “too much information” about the speaker’s emotional state. Learners can decide for themselves what they want to imitate, but they will have to live with the consequences. All major languages on the planet use rising intonation for yes / no questions. This is even true in languages that use question particles, when those particles are omitted in casual speech (as often happens). This is even true in so-called tonal languages, such as Chinese varieties. Rising intonation is a type of universal human non-verbal communication, much like a smile or a frown. Therefore, it is *not* an example of language change — it will never be considered standard intonation for statements in English. The fact is that it makes people sound weak, submissive, and lacking in self-confidence. This may reflect reality, or it may be a type of manipulative behavior, but either way, one should not expect to (for example) ace the job interview using uptalk.
Here’s a link to the TED Talk that James is referring to:
Want to sound like a leader? Start by saying your name right | Laura Sicola | TEDxPenn
Here’s a Youtube video where a man talks about and demonstrates uptalk, overuse of “like”, and vocal fry. The fact that the speaker is definitely not a teenage girl really puts the effect of these affectations into stark perspective:
We all make our own decisions about what kind of intonation to use. This will have a major impact on how others react to us, so maybe we should make the these decisions wisely.