I don't want to gloat or anything, but when the rumors about FSD in v9 have started I immediately purchased FSD...
I have anticipated a price increase from day one. Rumors have been going on for years that the current hardware is inadequate for FSD, and replacing hardware is labor intensive.
How do you know? There are very little companies that deliver a product that comes with hardware for features that they have announced without a timeframe. I can't think of any other product.
However, expected product pricing can change during development, however, the end-user will never know it has changed because it wasn't up for sale yet.
I can fully understand Tesla increases FSD pricing because it turned out development is harder than initially thought and thus development costs are higher. Or perhaps they do anticipate a hardware upgrade is required for maybe MCU1 cars? Or AP1 cars?