Maintaining some kind of Mass schedule by going on Wednesday is a healthy thing, just like watching Mass on TV is a healthy thing. But it’s not obligatory.
If you’re the kind of person who needs a kick in the tuckus to make sure you get to Mass on time, it’s okay to think about it as obligatory… as long as you know it’s not really. Similarly, if you want to think of weekday Masses as a “makeup Mass,” just to make sure you go, that’s okay.
But if it’s icy and blizzarding on Wednesday, or anything else happens, you can remind yourself that it really isn’t any kind of obligation, and stay home like a sensible person. Give yourself at least as much mercy as Mother Church does!
(And of course, a sensible person would also stay home from Mass on Sunday if the roads are too bad, because you’re excused. Insert personal story frome me about how I foolishly tried once to go to Mass after an icestorm when everybody was telling me to stay home, and how I broke my arm in the parking lot when I was almost there, and ended up going to Emergency instead of Mass. Don’t be an idiot like me. Unless there’s a heroic reason, accept a practical impossibility as excusing you from Mass!)