re: Will St. Augustine grass plugs overtake Bermuda?

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You will always have a mix.

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This. I had Bermuda which wasn't doing well because of poor soil and too much shade. So I used Roundup in the Bermuda twice, put down 2 inches of topsoil, and St. Augustine sod. The facking Bermuda came back from the dead and about half my lawn is a Bermuda/St. Augustine mix. The shadiest half is purely St. Augustine, the rest is about 75% St. Augustine but there is no getting rid of the Bermuda. It's been like this for 7 years.