I loved the idea of grand central / google voice. IIRC I got my number right after google acquired grand central.
I have stopped giving out my google voice number because I have less confidence in anybody being able to reach me at my GV number ten years from now (vs what is currently my t-mobile number).
People have been worrying that Google would shut down GrandCentral/Voice for years, though, ever since Google acquired it nearly a decade ago. So far those worries haven't been realized. Google Voice has even received major mobile and browser upgrades last year, with regular updates since then: https://www.androidpolice.com/2017/01/23/google-resurrects-v...
So it appears Project Fi doesn't work with Google Voice not because the latter is being abandoned, but because Project Fi is based in part on Google Voice so you can't use both at the same time. Google Fiber home phone service also appears to leverage Google Voice infrastructure: https://www.androidpolice.com/2016/03/29/google-fiber-rolls-...
I would probably suggest porting your Google Voice number to a secondary Google account if you don't want to make your Google Voice number your Project Fi number instead.
Fi is largely predicated on saving you money as long as you're near accessible wifi, right? I have concerns about switching it and using it when I'm away from a connection.
Same, and even when I travel without wifi the data expenses are pretty marginal. If you download your podcasts, maps, and translation dictionaries before you leave, and you don't have to have youtube or netflix constantly playing when not around wifi, it's pretty ideal.
