The argument is not if its going to break but when.
The Dana 35 is an inherently weak axle. The axle shafts are a known breaking point as is the axle housings.
But if your aware of the limitations of this axle and drive accordingly you should get an excellent life out of this axle.
Locking this axle with an ARB or any other traction adding devise, will not spell its doom, if you once again, know the limitations and drive with-in it. It will give many of years good service.
If your going to do some heavy off-roading, your going to break this axle even with super 35 axle shafts and a truss, period. This axle is Jeeps weakest link in there wrangler/Cherokee program. For on road driving it will hold up just fine, but even a simple tire spin on a snowy road then hitting a dry patch can break this axle.
For us out in slick rock country, we all carry spare axles even those of us with Dana 44's.
houtexs I would suggest you carry spare axles when you venture out, but every one of us should be doing that along with U-joints and other replacement parts.
You can find a cheap set at any wrecking yard for 25$ or so. And 25$ is cheap for a little peace of mind.