Are you thinking of this as an overnight? The trail is pretty much all downhill from Porcupine, And there are very few views along the way. North Dome is stunning, but the nearest water is about two miles away at Indian Canyon. The natural bridge is cool.
The trip back is obviously all uphill and still few views,
I look for trails that end up on lakes or streams for kids..because it gives them something to do in camp. This trip won't do that, unless they like knocking down cairns.
There are so many hikes that DO end at lakes: Ten Lakes Basin, 20 Lakes, Young Lakes, Cathedral Lakes, etc. You should be able to fine something more fun for the kids than North Dome. And in Emigrant there are lots more: Sword Lake, Bear Lake, Boulder Lake, etc.,,