I think I'd like something more flexible that all or nothing or even 50/50. Ideally I'd wanna work remotely and possibly do a week here and there in an office whenever I choose to or when big meetings / events are being held.
People should only go to office when required, that could be due to meeting or some special stuff that they cant have at home, also employees should be allowed to go home and work from there as soon as their work at office is done. It is a bit more planning but it certainly is best of both.
TweetMash