Yeah, the yew can be shared or cut way back.
Couple principles for the yews:
New growth happens near the cut ends- so if you just shear 'up' from the edge of the driveway, you're only buying a little time.
If the tops of shrubs shade the bottoms, bottoms may get bare. So if shearing, let the bottom be wider than the top.
I agree the junipers have outgrown their space. I would get them off the sidewalk, I personally hate when greenery invades walking space. And I believe they would stay bare if you just cut way back the lower parts.
