In 1930, the economy was going into a depression. Today, the economy is booming. It did help Saccone, although not enough to pull it off because he was a bad candidate, and his opponent was a good one, and this was an ancestrally Democratic area. But even then he nearly won. The economy will be even better by November if this keeps up.
I think the GOP will be fine in the midterms, and keep both chambers.
I would not be so sure. While I think that they will probably keep the Senate, I believe that the House has a serious possibility of flipping.
I'd think the Senate has a higher chance, but I think both chambers will flip.
I'm not ruling it out. Given what has occurred in Alabama, Virginia, and Pennsylvania, Democratic wins in Tennessee, Mississippi, and even Texas would not be too far out of the realm of possibility. But it would also depend on Democrats retaining hold of all their red-state seats, and some (i.e. North Dakota, Indiana, Missouri), could still flip even with this environment.