It would be pragmatism rather than capitulation.
Europe might be able to tolerate a summer of record high energy prices. But would they able to do the same over a freezing winter where families and pensioners can no longer afford to heat their homes?
The current public outrage is being fuelled by seeing bombs exploding on TV. Assuming that Ukraine can eventually be quelled and civilians are no longer being killed in their dozens, I think we'll see eventually see a lot of western governments backing down from sanctions. If they don't, they'd be at serious risk of losing their next elections.
It's a distasteful thought, but that's the way the world works. It's also why Germany waited so long to make the decision on NS2. If they could have avoided it they would have, since it was never in their own best interest. The same principle applies to everyone else's sanctions (including the UK).
For precedent, just look at all the oil the world gets from Saudi Arabia. What they're doing in Yemen is arguably worse than Russia in Ukraine. And yet the world tolerates it.