I will still offer tutorials online next year as well as f2f: I think they've been one of the revelations of this year - students realising they can have a one-to-one chat with us without having to come onto campus is something I think lots of people might want to hang on to. Tutorials, not seminars, though. Online tutorials mean it's marginally less frustrating when they book and then don't show up, too.
I don't think anywhere will remain wholly online next year unless something unexpected happens, though. I do think students are very keen for us to hang onto recorded lectures they can watch at their leisure, pause, rewind, etc, though, so I think that might stay.
I've been really impressed with lots of my students this semester who have done very well with online learning - probably because it's been clearcut and consistent with the national lockdown since Jan - they've not been continually unsure about what's happening next or whether it's fair. They've also had significantly more contact time and support than in a normal year, to be honest. And actually I think that coming back for two weeks after easter to a different form of engagement would have been quite disruptive to their learning, so I think this is the right call- just wish the government had been honest and open about it much much sooner.
Online learning is not necessarily inferior to sitting far apart in a room where you can't hear anyone properly because of masks, can't use handouts, can't have group or small group discussions, and have to clean your desk down at the beginning and end of every session.