People who don't pay attention simply don't, and will continue not to. The players that care will continue to care even with tells.

Using your same example for instance, in my state driving while texting is illegal. If they for some reason turned around tomorrow and made it legal, I don't think there would be this turn around where people simply started thinking "Thats a good idea!" that never did it before. The people who text now and texted before, still do it. The people who never did, continue not to. Idiots are idiots regardless of their means.