Gosh, that's a hard question!!!
To put it simply... there would be no story! ;v; Everything happens because of them anyway...
And realistically, Ally would never have known what her sight problem is and would live an almost normal life, probably as an artist or a common job; and Allen would move out, go to college, and work as a photographer and be depressed. Which is pretty boring x_x
Aahhhh this is so hard lol
But hey, that was a good question and it made me realize some things about my story! So thanks ^^
(posting again because I edited way too much in the last one, oops)