Interesting (and in an unfortunate way). If you were in my shoes, would you go ahead and replace the bulbs now (especially as the car's parked outdoors, and it's only going to get colder over the next several months)? I was going to wait until the bulbs burned out, but if this means the filament's on its way out...Yes. A used filament looks scraggly and may even be wavy in shape rather than perfectly cylindrical.
Yes, it does seem to be getting worse and worse. Even my wife (who doesn't tend to notice these things) was commenting the other day about how glaring the oncoming traffic has been -- and around here there's no end of cars (very often Priuses, for some reason) driving at dusk and nighttime without any lights at all.My Xmas season would be going better if there weren't so many nimrods on the roads at night with no headlights, high beams, DRLs, etc. I also asked Santa Claus for an end to red turn signals, but he just went "Ho-ho-ho!".
Hope your Christmas gets better soon!