Yeah, keeping this would be a dangerous precedent. If the state can presume you're guilty in a traffic case, why not extend it to other cases? Stuff like that is routinely used in legal arguments, "we are doing X so why can't we do Y which is essentially the same?" So say they'd go for "we have your phone located within the vicinity of where murder is committed, now prove you're not a murderer!" or "your license place was tagged next to the store that was robbed, now prove you didn't rob the store!"

And yes, very likely some people would abuse it to get out of traffic tickets. I'd rather have that than constitutional due process protections eroded. We're not doing super-great on that anyway, we don't need to do worse, and if some scoundrel occasionally not paying traffic ticket is a price we have to pay to avoid that, I am fine with it.