It won't be great in a lot of ways...not the least of which is that we'll begin to depend on the E-record, and then the PC will lock up, the 'net will go down, the hard drive will fry, etc.
Outside of fire or flood, paper doesn't ever just "quit working" right when you need it.
There will also be case after case where one missing letter, transposed number or other glitch make it impossible to find someone, or all their records, or something. Of course, that happens with paper, also...it's just easier to go looking for something material.
On the bright side, we are currently working on some of those issues. My hospital has been training nurses for a couple years already about checking for minor errors like that to correct things. It doesn't usually work, yet, but I'm thinking it won't take much longer than another...decade. Or so.