Kirkland batteries compared to Interstate

My Kirkland 100 month group 35 battery bought in Oct 2007, I have just replaced at Costco yesterday Jul 31, 2016 . I have always pushed Kirkland batteries as being the best. I was dismayed to see they now replaced it with an Interstate battery 48 month warranty. I am sad. Is Costco going the way of Walmart?
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Have a Kirkland Signature battery in my 2004 Chevy Cavalier with 133k miles. Sticker shows the battery made 7/11 and I bought it August 2011. Almost 6 years later, it's mostly working but starting to wane.
Ohioan on 4/25/17