Alliances would just split existing connections between server mates apart due to periods of inactivity and such. Lot of people play the game, in both ups and downs, due to their server.
Overall Alliances would reduce WvW population, commanders included, by my estimation about 50% and kill any timezone that isn't near primetime.
WvW needs other kind of patches though, ones that don't make matters worse
Alliances, Why We Need and When We'll Get Them
in World vs. World
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