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It's the pioneer gravity anomaly which will show that a modification to Newtonian dynamics is required. Then people will take the idea seriously. I'm not saying it's for definite, just that they all need to be thoroughly checked.
'Gravity Hills', where the apparent 'levelness' is not consistent, is just due to a localised mass of rock with higher than average density. In the 18ty century (I seem to remember hearing), a surveyor used surveys of a mountain in Scotland to determine G by estimating its mass and measuring the displacement of a plumb line when he put it close to the mountain.