The German train problems seem to be with the DB tracks. As explained to me, twenty or so years ago DB was privatised, and the companies milked it, without investing in upgrades. Predictably, things got worse, until something had to be done to hook into the high speed rail system. Now DB is being re-nationalised, and 20 years worth of upgrades and repairs are being done all at once, whilst still trying to keep the system running. So the system is flaky and fragile, and there's little redundancy because the "spare" track has been ripped up for upgrades or repairs.

So the problem is somewhat isolated to Germany, although failure of German trains to comply to their timetable then ripples out to affect train schedules in neighbouring countries.

So tl;Dr, Austrian trains will still be fine. :)