I'd like to think that my use would be the least invasive, but still. At some point the idea might actually not only catch on, but do so in a big way. And a lot of such facilities, no matter how careful each individual one is, creates significant new interaction possibilities, as a whole, that you have to be very open for regardless; especially when you become more aware of new flow circuits; systems you certainly don't want to be adversely affecting.
One nice thing about my launch system proposal, though, is that it gives us a fairly benign presence for research at the bottom as a side benefit. Something that could easily be mandated if this were the public works project I think it needs to be.