It’s impossible to predict that far ahead given the uncertainties of new Covid variants. My guess would be that things will be open but some restrictions still in place (face masks required inside, social distancing, museums reduced capacity and ticket only, restaurants by reservation only, etc). On the positive side the pace of vaccination has really stepped up in recent weeks so everyone will be ‘done’, on the negative side, last winter’s experience was that the virus thrived in northern Europe’s cold damp winter and it’s possible a new variant might reduce the vaccine’s efficacy.
As a tourist experience it may be better if some restrictions are in place, eg if you have to book museums in advance and capacity restricted, it will be much more pleasant than the usual scrum at the busier places. It will be expensive, bars and restaurants are trying to recoup their losses through the lockdown and prices have skyrocketed.
Right now, if you could get here, it’s actually really nice. Most things are open, including inside dining, but with so little tourism towns like Brugge feel like you have them to yourself. (I live in Belgium and travel to The Netherlands for work).