I never bought into the 17 Mach2 and I knew it wouldn't last with the competition from the 17 HMR, which in my opinion is the better round. Lesson learned, don't buy into fades from the gun and ammo people until it is well established. Another is the 17 WSM.
I have several of both 17HM2 (x10) and 17HMR (x8) rifles and think that the 17HM2 is a superior tree squirrel rifle. The 17HMR is faster and louder, but the the 17HM2 is at least as accurate and was a little cheaper to shoot. When Eley was selling match grade ammo for the same price as their mid-level .22 LR match grade ammo it was a great ego booster 'cause it was so easy to shoot sub-MOA groups with just about any 17HM2 rifle, even the inexpensive Marlins and Savages.
I'm sorry that the 17HM2 doesn't appear to be on track to be a long term success, but it is easy to rebarrel most 17HM2 rifles to .22LR and I suspect that down the road there will be lots of 17HM2 barrels for sale on eBay.
