Yup, two arms and two cartridges, one or two tables. That's the way for many. More than two is a little extravagant but why not ?
I personally don't need it but I don't listen to large scale music. Good for me or I would have to completely overhaul my entire system. Only couple of cables would remain where they are now. I don't chase extreme resolution and transparency either or I would want $10k MC and $20k phono stage, not to mention the rest of the chain.