Written history is a blink of the eye in the typical evolutionary timescales of the larger mammals, and a trait like a better capacity for learning is only likely to arise if it provides a significant selective advantage for that creature.There is nothing to suggest that over written history an animal today is anything different than yesterday in terms of the capacity to learn
Also, an increased capacity for learning means the brain requires significantly more energy resources which is a constraint if food is not abundant. It is thought that the harnessing of fire to cook food produced a surplus of calories that released the constraints on energy-intensive brain development, while the reduction in size of the masseter & temporalis muscles (involved in chewing) allowed the skull volume to increase until it was limited by the size of the female birth canal.
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