Have yet to see a reasonable argument favoring the test window in June over one in July. IMO July would work better for all SH and NH teams. Allow Super comp to be completed and provide touring teams anopportunity to play some lead-ins before the tests.
I don't think the Northern Hemisphere teams would want this tour any later than it already is.
Their brief off season happens after this series before they start up again in mid August.
If Super Rugby went straight through with its current format, it would finish on July 12th and a three test tour would then go until the first Saturday in August.