All of this is still somewhat uncertain. That said, if the location is in Sacramento, I think it's a large-enough shift that they should allow temporary free transfers both to (and from) the new data centre. It's the least they can do.

That wouldn't necessarily apply had they made a shorter (and arguably more logical) hop to, say, Chicago, but moving 3000 miles is significant. It makes the server newly-viable for people in Oceania, and completely screws people who were on it from the EU. It's not a relatively minor shift.

Speaking personally, though, I think a shift to Sacramento would be a tremendously stupid idea. It's not balanced for North America (just as Montreal wasn't), and this is supposedly the NA data centre. Dallas, Chicago, even Denver would have been far better choices from a geographical standpoint, and all three have perfectly adequate support infrastructure. Coupled with the lack of prior notification, and a lack (thus far) of free transfer windows, and this move just reeks of borderline-incompetence. Then again, so does most everything technical in regards to FFXIV, from the engine limitations, to the "too much character data" excuse given in response to a host of player requests, to now the (possible) server placement. Colour me completely unsurprised.