His everyday life? Definitely.
She won't follow him to Mewni. If she does, she won't be staying long. Marco didn't make time for her before, and doesn't have time for her now. I wouldn't blame her if she's tired of waiting for him.
On the other hand, Marco has dimensional scissors. He can go after Star, and he can go back to Earth at any time. It's possible that Jackie accepts and supports Marco's decision to help his -best friend- and they don't break up.
I think that's a wasted opportunity though. It means a lot more for Marco and Jackie if they split up over this. Jackie gets a chance to show some independence as a character, Marco loses the girl of his dreams because he was playing things too safe in their relationship and learns a lesson. Conflict is the best way for characters to develop and grow. Besides, Jackie becoming Marco's long-distance girlfriend out of the action just regulates her back to the same role she had in Season 1, just a stopping block for Starco. Or even worse, since that situation is primed for nasty drama if anything at all happens between Star and Marco while he's still "dating" Jackie.
That all said, even if they break up, there's no reason for Jackie to be written out. Mewni is the new primary setting, but I'm sure there will still be some Earth episodes. I'm also sure that she'll get retooled in some way, somehow, to be relevant to the greater plot, but that's a longer way off.
A big takeaway from the new intro is that Marco's room has apparently been magic'd into Butterfly Castle, so he's definitely living on Mewni. Doesn't bode well for Jarco.