> SpaceX could start lobbing things in his direction within maybe 30 days?
If Earth and Mars are on opposite ends of the sun, nobody is going anywhere within 30 days. I do not see how anything will change from the one transfer window per ~2 years for the foreseeable future
While this doesn't apply in the scenario that the person you're responding to has given there are ways to get many more transfer windows between Mars and Earth using Aldrin Cyclers.
You couldn't start launching things in 30 days, you need to wait for a launch window, which happens every ~2 years. The transit times are on top of that.
Higher energy transfers can widen the launch windows, but their frequency remains unchanged. The frequency is due to the synodic period of Earth and Mars. It doesn't matter how fast you can get to a point in Mars' orbit if Mars doesn't happen to be there when you arrive. Any given trajectory will only work when the planets are in one specific configuration relative to one another; having more delta-V to play with means you can choose from a broader range of possible trajectories.
In the limit, there are hyperbolic trajectories that would basically give you such wide launch windows that you could launch whenever, but you're not doing that with chemical rockets.
If Earth and Mars are on opposite ends of the sun, nobody is going anywhere within 30 days. I do not see how anything will change from the one transfer window per ~2 years for the foreseeable future