Assuming 1 year between major releases (7.3.0 -> 7.4.0 = +- 1 year), then we have 7.5-9.9 = 26 years = up until +- jul 2030. if we skip to 8.0 now, then we have up until 2023.
Also we have 1 more chance to skip major number: 8.x -> 9.0. Imagine what features will there be in 9.0 that is ground-breaking enough. Because after that, we don't have any more major number to jump into without going into 2 digits.
I personally don't see the major number as a very magical thing. Look at Linux for example. People still see 2.6 as very different/ahead compared to 2.4...
-- dave
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