The original point was to be able to shoot cheap ammo.
Will that continue to be available in the future? I will go out on a limb and say yes, but it looks like the playing field is getting thinned out.
There is a more fundamental issue, too. What's the target, and how far is it? In other words, does 7.62x39 have the ballistics needed to do the job? Considering the typical load is similar to the .30-30, is that curve flat enough and have long enough range to do the job?
For plinking cans or on a competitive range, likely, hunting elk, not so much. Goes to, what is the point of the rifle and why that cartridge? If it was a matter of hunting, other cartridges would shoot flatter and deliver better results, even with a shorter barrel, like 6.8SPC. Or, shoot further, like 6.5G. Or, be the currently cool cartridge of the month, like .300BO.
I wouldn't worry too much about the bolt or barrel with x39, the magazines are available and the makers will get you one that will work, which is a real triumph over "just because you can doesn't mean you should." A lot of owners get them to shoot. If anything, shop for one that uses AK mags. Works better, and a lot more rare.