CNC machines have pretty much killed dedicated line-boring machines, though we do still have one at the shop where I work. It has not been used since we moved into the new building.
It, along with a sliding saw, saved the day during the transition. We were in a temporary building for a few months and totally without a CNC machine for the first few weeks of that time.
A line-boring machine is a one-trick-pony, there are better ways today, where that same investment can do more for you.
I suppose it depends on how much volume you need to produce? A small shop that does kitchens one at a time? It may be more cost effective to saw cabinet parts and line bore them?
It's a big step to get into full-size machines that take most of the labor out of it. The speed goes way up, but then you need enough volume to cover that cost.
There are countless jigs out there. The ones using drill bits are a waste. You need a router-based system for any kind of volume.
