Well you could use it but you may not get the flavor you expect. Since it is a wild yeast the profile may change after initial use. If you read Wyeasts information on the sour yeasts they state that "Propagation of this culture is not recommended and will result in a change of the proportions of the individual components." In other words one of the bugs may become stronger and give you a different flavor with each batch.
(1 Timothy 5:23) . . .Do not drink water any longer, but use a little wine for the sake of your stomach and your frequent cases of sickness.