The partnership between Motorola and GrapheneOS is a long term one. The effort that is put into providing the needed hardware security requirements also benefits Motorola directly, as they can use that hardware themselves. What you are predicting will happen is not corroborated by evidence.
Motorola is porting GOS to the device. They can just decide not to bother anymore. There’s no evidence to speak of, the partnership is 9 months old.
Motorola has directly seen the immense interest in GrapheneOS from both individuals and businesses. This post is an example of how it greatly increases in the interest in their devices. They're aware not everyone is going to buy a high end flagship and want to have cheaper devices with it.
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