I'm no pro, but I would think doing it now would benefit the ones remaining so they could get the sun they need to better prepare for the Winter.

I would love to have all the Blue Fescue you want to throw out. Interested in trading?

It is typically recommended that warm season grasses be transplanted or divided in spring. These grasses have root systems which go relatively dormant in late season and you run the risk of winter cold damage in many parts of the country because the roots do not have sufficient time to re-establish. Cool season grasses resume an active growth mode in late season and in most parts of the country these can be divided or transplanted in fall without worry.

Donn, in your zone 7, you should be able to transplant either warm or cool season grasses without worry, although I may consider mulching the warm season selections if you experience much winter cold or unless you get reasonable snow cover.