Bloody hell, I hope not. At present, tablets simply aren't as good for reading on. The combination of long battery life, ruggedness, ease of use and lack of glare makes e-readers fit for purpose.
I'm still using my original Kindle, sadly the damn thing simply won't die, so I've got no excuse to upgrade. It's survived tropical and mountain trekking, various beaches, getting a little damp and general packing abuse without turning a metaphorical hair.
As for ease of use, my 94 year-old mother-in-law will only have hers prised out of her cold, dead hands. She doesn't want anything more complex, just something she can read. Everyone in our family owns Kindles of various models, we are serious readers :-)