After Luna and Mercury, there will be very little use of the other planets, other than small moons.
I disagree.
Planets are just too darn hard to get on and off of.
Only if you use primitive launch technologies which require the ascent vehicle to carry all of the necessary energy and reaction mass for the ascent.
Seriously, you think that in your scenario, we'll still use rockets as the main way to get off planets?
The first thing we need is one or more ways to launch things into space where most of the energy and reaction mass is not carried by the launch vehicle.
None have proper gravity or pressure for us.
Venus could be cooled down with a solar shade in space (which could double as a power plant) and be transformed into something more habitable than its current state.
Also, some applications work in a wide range of gravity. You can have fairly normal kitchens, bathrooms, swimming pools, showers, sinks and toilets on Mars, despite only having a third of the gravity of Earth.