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Your picture shows buds just developing. So say about a month to open a flower, then three months in bloom. You are delaying the repot four months at least.
Sounds like you don't want to repot, and if so, you should follow your own instincts, as Synda said.
However, I don't think you will get flower or bud drop from repotting a phal with immature buds. Flower drop is much likelier when the flowers have been open for a while.
Most of the stress to a phal from a repot comes from it staying too dry in new medium that doesn't hold much water. If you are careful to make sure the new medium stays moist, by watering a day or so sooner, you shouldn't have any trouble.
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