It'll be thick for sure. 26 trees an acre is a good hair cut. Not familiar with the maple borer. It's not the Asian long horned beetle is it? You better get your sang out of there now, you'll not be able to find it for years.
Here's some reading on the maple borer for you How to Identify and Control the Sugar Maple Borer
And yes, I plan on digging it all if its 3+ years old. Either dig it or the skidders will just destroy it is the way I look at it.