[mom-from-missouri]

Speaking as a former phone repair person and also as a customer service rep.....
I recommend it IF you are moving or for a new instal--at least until you see what the wiring is at your new location. Then if its good wiring I would rop it unless--
You have old wiring that has one line that runs from jack to jack (like the old christmas tree lights--with that wiring, if one jack goes out, they all go out). If you have that, put in a new jack that is independent then cancel the others.
It would save you money if you lost every jack in the house--but for that to happen, usually there is lightening or something else involved in which case your home owners insurance would cover it.
A jack is real easy to istall (unless you have concrete or brick). If one breaks sometimes it is just easier to run a new one.