Business Contact manager is still fully supported - it's just not supported on the latest version of outlook. On Outlook 2010 you've got support through the end of 2020. For Outlook 2013 they haven't announced an end-of-support date yet.

Microsoft Invoice has transitioned to a cloud-based product, so again, they didn't end support. You might not like the new purchasing model, but that's very much different than them burning the product to the ground.

https://einvoice.microsoft.com/Default.aspx?MSIStateKey=f513...

Sharepoint is the backend for onedrive for business, and fully integrated in to Teams. What on earth would make you think it's going away?