GDRP is a reflection of a mass surveiled and dystopian ad ruled society. GDRP makes it HARDER for consumers once the’ve consented. All that will happen is that this will be gamed instead.
The "consent" popups you see on loads of websites these days actually run counter to the GDPR because they usually opt-in by default or tie consent to uses for which that consent is not necessary. They also rarely provide detailed information about what data is used and what they do with it.
The point is that there may be multiple lawful bases for collecting the same personal data and it may be used for multiple purposes. The fact that consent was one of those bases does not necessarily convey a right to erasure if others still apply after consent is withdrawn.
Moreover, given that one of the other lawful bases for processing is the infamous "legitimate interest" umbrella, which could cover almost anything or almost nothing depending on subjective interpretation, the whole situation is quite ambiguous.