I think I'd manage to, although I wouldn't look forward to it (and wouldn't agree with it). I'm a sahm and DH has been wfh reasonably well (though it's cramped in our 2 bed flat). Financially we're not affected at all (except a marginal increase in food bills with DH at home). We have a toddler who is missing other dc, but he saw most of them at toddler sessions which have all been stopped anyway. He's only 23m though so is still doing parallel play, and seems happy enough playing with me and DH. We would have no choice sticking to the rules because most activities we did before have been closed - visits to museums, galleries, theatres, restaurants, leisure centres. There's not much that we could actually do to break the lockdown rules really.
We don't go out much to shops/bars/pubs anyway due to DS, and I don't really have friends who I see regularly, so I don't miss that. We're not a very sociable family. It would be strange not seeing other family members for a year, but we only see them about once a month anyway, so I'm not missing them that much. I think my parents probably miss their dgc a lot, but they're the most vulnerable of all of us.