We can implement this pretty easily, would make things easier for users, tradeoff is that users are less aware that setting data this way is slower than setting data that fits in an existing buffer. We can just document it well.

image = fig[0, 0].add_image(np.random.rand(10, 10))

# allow this, internally delete the existing buffer 
# and world object and create a new one
image.data = np.random.rand(20, 20)

Might not have to create a new world object, might be possible to just replace the geometry I think.