I am also a long-time Google Voice user. It's been my primary number for about 5 years now.
The issues you raise are all irrelevant, except for #4. They are not killing off Google Voice phone numbers or functionality. They are just rolling it into Hangouts.
I don't know what they are planning to do with their google.com/voice web property though.
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The issues for a LONG TIME Voice user:
1) Voice Mailbox - What Now?
2) My mobile phone number IS my Google Voice Number (Sprint)
3) Ring at multiple locations (Isn't valuable to me anymore)
4) The google.com/voice web page is a lifesaver for searching through my text, and voice mail. (Most Needed Function)
I am also a long-time Google Voice user. It's been my primary number for about 5 years now.
The issues you raise are all irrelevant, except for #4. They are not killing off Google Voice phone numbers or functionality. They are just rolling it into Hangouts.
I don't know what they are planning to do with their google.com/voice web property though.
Also MMS support. I know this works for certain carriers through some sorcery but for regular GV users we're stuck with hacky solutions.