While I agree with some of the article, it misses much. The 17 Mach2 is more expensive, very difficult to locate (worse than 22's for now), much louder in the deep woods were stealth is needed, and isn't any more accurate than a boat load of average 22LR rifles. Also, rifles for 17 Mach2 tend to be harder to locate. While those who shoot few squirrels may appreciate its flat trajectory and not swayed by the negatives, price, noise etc, for us old dyed-in-the-wool squirrel hunters, we do not see it ever replacing the ubiquitous 22.
I have hunted squirrels since childhood, and growing up in the Southeast US, squirrels were everywhere and a mainstay of hunting for beginning youth hunters. In young adulthood, a morning or afternoon hunt would easily reach the limit on squirrels, and those shots would be from 5 yards to nearly 100yds in tall, large oak and pecan groves and even fox squirrels in corn fields.
22 rifles I use/used were mostly scoped, Remington 541/581's, Remington 572 pumps, Ruger 10/22's, older 513T's scoped and iron sights, Marlin lever and semi's, CZ American, Ruger 77/22custom, and a few others. Except for a couple of worn out semi's and using the rifle's favorite 22 brand, all these 22 rifles would easily shoot sub inch at 50 yards, with many shooting 1/2 inch, or even smaller, groups at 50yds. And 50 yds was the typical zero range with the occasional 75 yd zero for late season hunts in leafless oak groves. Even today and living in Colorado, most of my 22's are zeroed at 75 yds, and my wife and I routinely practice on 1-2 inch target spinners and swingers at 75-150 yds. Small spring P-dogs, black birds and others pay a dear price if found within a reasonable range.
Since 22 ammo was very cheap(compared to 17Mach2, if found, they still are), these rifles would see a LOT of shooting fun and long range practice, and the ever present informal and formal shooting competitions, turkey shoots, etc. On that note, 22LR's history of fantastic groups at 100 yd competition is unquestionable, and the old 513T, Rem 541 and my Ruger 77/22 custom using higher velocity hunting ammo shoot ragged dime to nickle groups at 100 yds.
The versatility of a good 22 rifle is another factor to consider, for when hunting close to feeding locations, stealth is often a consideration. Thus, 22 Standard Velocity loads made for an even quieter hunt, and on some occasions, 22 shorts made for fun at shorter distance and stew pot filling. Then there are the CB loads for close in pest control and a few hunting apps, and the versatility of wearing any one of my 22 pistols or revolvers and not having to carry 2 different calibers of ammo.
Once I did have a desire to hunt squirrels at longer ranges, and I thought about the good ol' 22 Mag. As I pondered this choice, the V-8 moment hit me, I already owned a nice and very accurate Rem 700 BDL in 222 Rem that I could reduce load to similar 22 Mag performance. After short load work, I had a bulkbox 50 gr SP bullet on top of a load of Herc Unique that yielded 1,900 fps over the Oehler, and it gave me 1/2 moa @ 100 yds. That rifle and load took a lot of grays and fox squirrels from the pasture and fields edges.
When all things are considered, the ubiquitous 22LR rifle and its ammo match makes for a unique package that is very hard to beat. Others will shoot flatter, hit harder, be more modern, etc, etc, but when cost, practice amount, ammo availability, noise levels, versatility, etc at seriously looked at, the 22 remains and will remain the popular favorite.