I hope to be proven wrong, but I have my doubts that Apple will support Intel beyond a year or at best two after the hardware transition is complete.
The same KB article indicates that what they consider to be obsolete (not at all supported) is hardware that is about 8 years or older, with most of it being 9+ years since first introduced.
Except for the original iPad. That still stings a little. They released it in 2010 and dropped support in 2012. But it was basically unusable with iOS 5 in 2011.