I mean, yeah, no product will last forever. MSN Messenger was alive for 14 years and was slowly dying as users were moving on to other services. At a certain point, it becomes unprofitable to keep sustaining a service. But even when it did get discontinued, all Messenger accounts and their contacts got transferred to the Skype service. If you still wanted to talk to the same people, you could just through a different client. You could sign in to Skype with your same credentials and talk to the same people for over a year before that happened, too, to give people time to adjust.

Groove Music is an even more recent example. Yes, the service is going away, and certain parts of the deprecation might be annoying (you have to download all purchased music before the end of the year, for instance) but all accounts can be migrated to Spotify, a previous competitor of the service. It's not like we left people completely stranded without any options.