The full size iPad will not suffer - its big enough to really be in a different class. However, I can see the plus cutting into mini sales, more so for those who might now be hauling around the iphone and mini regularly. For many, there is still a big enough size difference for reading full pages of text - books, magazines, web pages, etc that makes the mini a more compelling device - but those not comfortable hauling around a mini, may opt to compromise and opt for the 6 plus. I see full size tablet sales as perfectly safe.