The point is that the 3rd amendment is not relevant anymore given that the military has such an enormous budget they have no need to quarter in your house.
The 3rd amendment has never been used in any Supreme Court decisions, and in fact has only ever been used in a single appeals case in 1982[1] (thus there is only one instance of precedence for this amendment -- not to mention that the judge and appeals judge already accepted the Petitioners' argument under the 14th amendment).
I think that a part of the constitution that has only ever been used once, and was based primarily of a fear of a repeat of one of the Intolerable Acts in the 18th Century is hardly a relevant amendment.