My hope is that someday the DCEU movies will crossover with the Arrowverse.
The Flash TV show has confirmed the existence of parallel universes so all we need is for a DCEU film to discover them.
With Lord & Miller writing The Flash film they could be the guys to open the connection.
This could all lead to a Crisis on Infinite Earths type movie with TV tie-ins;
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Earth Prime - DCEU
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Earth 1 - Arrowverse
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Earth 2 - (as seen in The Flash)
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Earth 3 - Supergirl
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Earth 4 - The Flash (1990's
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Earth 5 - Gotham
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Earth 6 - Smallville
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Earth 7 - Donner's Superman
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Earth 8 - Nolan's Batman
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Earth 9 - Batman 1-4
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Earth 10 - Batman '66
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Earth 11 - Green Lantern
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Earth 12- Jonah Hex (movie)
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Earth 13 - Catwoman (movie)
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Earth 14 - Wonder Woman (1970's)
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Earth 15 - Steel
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Earth 16 - Birds of Prey
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Earth 17 - Constantine (movie)
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Earth 18 - Watchmen
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Earth 19 - Swamp Thing (movies)
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Earth 20 - Swamp Thing (TV)
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Earth 21 - Lois & Clark
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Earth 22 - Adventures of Superman (1950's TV)
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Earth 23 - Shazam! (1970's TV)
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Earth 23 - Superboy (TV)
The remaining 29 Earths are free for future Earths such as the Legion of Super-Heroes who were referenced in recent episodes of Flash and Supergirl...