Regardless of what was behind it, that it happened was lovely. It's really nice to see them start growing older, and wonder what place longer-term plans might have and hold for them. I can see Viserys also being worried in some way that any children he had might suffer as he did - he's far too self-depreciating in that regard, both in regards to himself and others around him.
Something I've actually wondered on occasion, and I'd be interested if you'd confirm it, is if his past memories as a child actually drove his desire for peers over subordinates in some way as well. Subordinates will not challenge you, not really, and even if they do you can override them. But peers? Peers are different. They can challenge you, in fact they're expected to. And I wonder if some of his drive to seek them is down to the tiny part of himself that knows the madness of his father could be in his blood too, and wants people around him capable of tempering it if it ever comes.
That's definitely a part of it, though not one he likes to consider very often for obvious reasons.