You're thinking too small. It's going o take a massive re-education effort to get Trump supporters back on the right tack.
Nobody likes to admit they were wrong so that's expecting too much. Their decisions have to be based on things that hit close to home. Right now they're all giddy about getting more money in their paychecks which they don't realize is nothing more than a bone to keep them quiet while Trump runs off with millions.
If Trump hits up the entitlement programs like he says he going to do there will no doubt be some fallout. But they still won't realize that he's once again using their money to reimburse for what he's already heisted.
The re-education effort is already underway in the form of the Mueller investigation. But it's a slow progress due to the necessity of secrecy. When Mueller drops the bomb on Trump, his family and his entourage, the message of how badly they've been taken to the cleaners will probably set in.
In the meantime, it's vitally to important to vote the Republicans out of office in the mid-terms to start putting the brakes on the damage Trump is doing to the country.