Edited Date/Time:
I think it would be awesome to make a Fat Tire BMX (20in x 4 tires) or Snow/Sand BMX for the following reasons: (when I say fat tire I mean at least 4 inches wide like fat mountain bike or fat sand bikes)
1 - Easy riding on snow or sand!! - Can be an all season sport, no more sitting around during winter waiting to go to an indoor park or sheltered spot (if it is close enough to you)
2 - Imagine Taking a fat tire BMX bike to a Ski/Snowboard mountain and biking and carving along side snowboarders would be awesome as well as using the downhill half pipes, grind pipes, grind logs, long ass downhill grinds and other obstacles.
3 - the dirt style tracks / jumps that can be built specifically with snow can turn any winter wonderland backyard / front yard / street / field into a sick BMX track, jumps at the bottom of local sledding hills, the options are endless
4 - can add BMX to Winter sports categories where BMX never was before!! can become another attraction for ski and snowboard mountains and keep them going as BMX and mountain bike mountains during the off seasons as well.
5 - BMX Freestyle models, snow Jumper models, race track models
Please add if your imagination runs wild!!