While it would be interesting enough for one mid-grade Golden Age book to sell for over $1,000,000 after we fell just short in 2016, in my mind there's a chance that both the Action Comics #1 and Detective Comics #27 in the current ComicConnect auction will sell for over $1,000,000.
The case for the Action #1 is clear. A FN 5.5 almost hit $1,000,0000 in 2016, so if the right bidders are in for this one then getting another $44,000, even .5 lower is a real possibility.
The Detective #27 is more interesting. A 5.0 sold for 710,000 in May of 2017. Does another 1 point gain another $290,000? Does the fact that unrestored Detective #27s have been coming up for sale less frequently than Action #1s make a difference? Time will tell!