CREATE TABLE table_66953 ("Year" FLOAT, "Division" TEXT, "League" TEXT, "Regular Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

What was the average year that the Nashville Metros did not qualify for the Playoffs, did not qualify for the Open Cup, and had the Regular Season 7th, Southeast?
SELECT AVG("Year") FROM table_66953 WHERE "Playoffs" = 'did not qualify' AND "Open Cup" = 'did not qualify' AND "Regular Season" = '7th, southeast'
SELECT AVG("Year") FROM "table_66953" WHERE "Open Cup" = 'did not qualify' AND "Playoffs" = 'did not qualify' AND "Regular Season" = '7th, southeast'