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'Most' is important to recognise here. I'm studying theology at Cambridge University and at least one current professor (in a small faculty) advocates strongly for an early dating of John (i.e. pre-70). It is important to note that a lot of the rationale behind dating, as with Q itself, is supposition/educated-guesswork. To take the example of John, arguments for a later dating, which is the mainstream perspective, is based on the idea that the theology is too developed for it to be early rather than direct historical evidence. Paul's epistles, which are early arguably display a very high christology, suggesting John is not such an outlier here.