Yeah exactly, the antenna's are going to draw more attention than the license plates. When you see a vehicle with antennas that's the first thing that caught your eye, the antenna's... Just pause and think about that, when i read these posts i thought to myself "i didn't look at the plates until i saw the antenna's anyway"....
As for the plates material... Nope, cardboard isn't next but plastic is. Some states are already using plastic printed plates, and some are starting next year. I wouldn't doubt MN will join in there now that we have the flat plates that are printed, they did say it was a stepping stone to paying for having the printing machines that can print on any material. So in theory they could easily swap out the metal blanks for plastic now, the new machine doesn't care what they are made from.
I have also seen how the new flat plates hold up here, hit a few snow drifts in the winter time and they are all bent up. The stamped plates seem to have better strength, makes them more rigid. Oh well, not our choice.
At least i don't live in SD, they have a horrible system there. When you get Amateur Plates you have to keep your original plates in the vehicle, most seem to toss them under a seat or in the trunk, and they also have to keep the tabs current on BOTH sets of plates. What's up with that?? Unless they changed that with the new system, in SD now all plates are lifetime plates like our Amateur plates. You get a set of plates issued when you purchase a vehicle and have to keep them when you sell the vehicle and buy a new one and transfer them.