This has nothing to do with ASICs, given 3600 coins a day and more and more miners join the game (I guess more than 40000 now), each person's average coin income should be less than 0.1 bitcoin per day if all of them have access to the same technology
That's an intended design from Satoshi. Manufacturing of money should be the same as any other business, when it is too difficult to manufacture money, people should work to provide goods/services in exchange for money, thus raise the value of money, but if too many people are producing goods/services to compete for a limited supply of money, the money's value will rise, thus make manufacturing of money profitable again. In this way, people either manufacturing money or manufacturing goods/services, they always have some thing to do, thus 100% employment is reached
So, until we see the exchangeable goods/services/even fiat money for bitcoin grow by a large extent, the bitcoin's mining profitability will keep dropping due to more and more people joining the mining industry
I'm not sure what you mean by "more miners join[ing] the game." There's more hashpower coming online, but that doesn't translate into more miners -- it's *fewer* miners with ASICs. The gamerz hashing with their boxen are pretty much out of the bitcoin game already, and mining at a loss with a USB stick & Rpi is ... well, more fun than watching paint dry. There is nothing to "hack" on those USB sticks -- the novelty wears off pretty quick, you'd have more fun hacking a thumb drive.
Mining is becoming a real business, with *scores* of ASIC chip manufacturers *with no product to their name* offering pre-orders, lulzy IPOs & bizarre hybrid mining/ASIC manufacture offerings (i have nothing but respect for the guys on the tech side).
Why do people buy into these IPOs? Because profit.
They're buying into the second-highest tier of a pyramid scheme. As long as they keep their mouths shut, and let the IPO issuers manage the hype machine, they will profit.
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