We are not aware of any plans to discontinue or replace the Companion 5, it's a very popular computer speaker system. I suspect the local stock issue is temporary.
Dec 10, 2017
Thank you for your post. There is no actual difference between the Companion 5 and 50. The only thing is the Companion 50's are not available in the US/Canada for purchase.
Let me know if this helps.
There are a little design differences, but the most significant differance is that the Bose Companion 50 has a 3,5mm jack and the Companion 5 has a USB connection with build in sound card. My companion 50's are sounding great!