Here's my problem with the whole "Hyuga-hybrid" thing. Sarada's a half-breed too. She's half Uchiha, yet nobody has said anything about her "not having the Sharingan."
Oh? She has black eyes like Sasuke, so of course she can use the Sharingan? Well, guess what? A shitload of other characters have black eyes too. Not to mention, Sarada has prescribed glasses, so we know her eyesight sucks.
What exactly is your problem with Sarada???
She can have OR NOT have Sharingan - and we WON'T KNOW it until P3.
Byakugan, though, SHOULD result in WHITE EYES, thus the ONLY way (but still a PLAUSIBLE way as well) for Boruto and Himawari to have Byakugan, is to pull off a Gohan.
But it IS possible as far as canon goes - cause nothing CONTRADICTS such a possibility.
Plus, this the most OP'ed family LINEAGE-wise anyways.
(Basically, a Kaguya genetic recompilation, mind you.)