there's absolutely nothing wrong with being safe, and the motivation behind this may well be safety, but you can guarantee that any momentum behind this will be driven by money, and not safety. you know that anyone who owns a tire dealership, or a chain of them, or maybe even a tire factory (if we still have any in this country?) will be contacting his or her local representatives and telling them how they should be backing this type of bill. that representative will then push it forward along with their fellow representatives from other areas, and before long, it will look like the entire country wants it, and it will then become law. we're often too quick to jump on the bandwagon even if safety is the factor.
in the end, it will only be the lower middle class burdened by this plan. if you have the means you will probably be minimally impacted by the extra cost. if you are just barely squeaking by already, this will be one more burden putting you closer to the edge.
if you are already below this mark, then it won't matter. insurance is generally mandatory, and i can guarantee that there are a bunch of you who have been hit by an uninsured motorist even though it is law to have it. if you can't afford it, then you don't get it. the only way it even becomes an issue is when you are in an accident. if everyone carried insurance then we wouldn't have to worry about our policies having uninsured motorist coverage. you can't tell the age of a tire except by very close examination, so that will only happen after the fact too.
Odds are we would spend more initiating a plan like this than would be generated by it, since most tires are worn out before the 10 year mark.