Well, I could say you have to have a banking license, 'just to participate' in banking business. You need a license for frequency 'just to participate' in communication business. And there are no small licenses for starters, i.e. not affordable for an average person. Bitcoin personal banking system lets you 'mine' at very low cost. Right now you're complaining that in order to dig for gold you have to buy a shovel, since all gold on the surface is gone and you can't just take it with your hands, so to speak. However, unlike shovels for gold digging, ASICs can be eventually integrated into other, more casual items, like cars, public bitcoincard processing hubs, even laptops and cellphones. That's if Bitcoin becomes widely accepted....
I think trying to compare mining bitcoin to two federally regulated industries is a bit of a straw-man argument. With that said I'm not even going to bother talking about those points. As per your shovel and mining gold analogy: I view digging with your hands akin to CPU mining and the shovel akin to GPU mining. You can mine for gold with a shovel, sure. You can also pot plants; dig a grave, ditch, hole; and clean up dog shit. A shovel is a pretty versatile tool that can be used for many other things than digging for gold. In fact, a lot of people already own shovels so re-purposing the shovel to dig for gold means anyone who owns a shovel can potentially dig for gold. I suppose one could say that the FPGA is like a back-ho. It's much more efficient, however it costs more to purchase and at the end of the day, in most places you need to be a ticketed operator to use one. I view the ASIC kind of like a specialized industry specific machine:
It's going to be insanely efficient at serving it's purpose (ignoring cost), and it's not something you have just kicking around the backyard. It's also got no real use outside of it's intended industry.
All of those points aside, I think there's a
massive disconnect between the current ASIC state and having manufacturers designing BTC mining ASIC into everyday appliances. Do you honestly think you're going to see GM shipping trucks that mine bitcoins while you drive at any point, ever?