Yes, part availiabilty is usually an advantage with large and long tradition companies. Also the good thing on the other hand is that passive loudspeakers usually don't "wear" significantly over the years, I have several loudspeakers which are over 40 year old in my collection which all work fine.
Which German loudspeaker brand gives currently 10 years warranty? AFAIK Elac and Quadral used to have it but it seems not anymore, the only current one I can find is the more exotic and expensive Gauder Akustik?