In my life I've found that people are either readers or they are not.
The most important factor is the encouragement of reading for enjoyment as well as for learning.
This needs to be done in a child's formative years, by parents, other family members, family friends and teachers. My two granddaughters live in a house where books are in every room. Mother and father read to them; the oldest, at seven, is reading on her own. She has probably read 15 - 20 books this summer, long ones. She's read up to book 11 or 12 of Lemony Snicket's Series of Unfortunate Events in the last couple of months.
I have given both parents an ereader, one a Sony 505, the other a Kindle 3. (Amazingly, they are able to live together
) These are a factor, minor, in the family's reading environment. Used books, friends, the library etc. are much larger factors in the children's reading environment.
The oldest is also very computer literate, but dedicates an hour every evening to reading. I have sat with her and also read during that hour. I find it amazing.
So, my conclusion, ereaders at this time are a help but not the revolutionary equalizer, yet.