Yes, because in the next week they'll stumble upon the magical bullet to destroy Alito that has escaped them in the months preceding this vote.
They will take the weekend and claim this as some sort of victory, when in fact it's a parlimentary parlor trick.
They will pepper the airwaves with anti-Alito ads, have multiple calling/e-mail campaigns to pressure senators to sway their votes and there will be a lot of grandstanding over the next week.
It's better to have it now rather than a week.