Actually, you don't "have" to switch until you are ready to do so. In fact, its probaby a bad idea if your currently site is heavily modded. I asked this same question over on the support site and here was the response I got "You should upgrade to 3.8 when its 3.8.1" and I have to admit that, given the nature of software development, waiting is always a good thing. My point is that you are not obligated to follow the release cycle, its a bad idea generally.
HTH
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