Do what is in the customers' best interest ...... for many small business customers the right move is to split the pairs.

I know if someone were working for me and said... hey ... i can save you a hundred bucks or so by doing X... which will work fine ... or Y which wont' work any better ... i would say "thanks" and put the hundred in my pocket.

If i was the head of the telcom department at a large company i would tell them to run a new wire.