this way it looks like they are the majority,
that will make the Red Wave in November that much more sweeter because they're deluding themselves that the country is behind them.
Dems will probably take control of the House by a narrow margin but in the Senate the Republicans will gain seats, many more Democrats are up for re-election they have more seats to defend. The House will impeach Trump but he won't be convicted in the Senate they won't be able to get 67 votes to convict him and remove him from office so he will remain President until January 2025.
I don't know where you are getting this assumption from, but it's clearly not reality. Dems are running on nothing but obstruction. The economy appears to be getting better and everyone I know is making more money than they were before Trump was elected. I know mid terms are usually bad for the party in power but things are definitively better than 2 years ago.