Japan might tax the use of unlicensed spectrum for wireless LANs to protect market for licensed spectrum holders: The logic cited is fairly bizarre--that charging for unlicensed use is "fair," which I presume means "fair to companies that paid large amounts of money for cellular telephone spectrum" but not "fair for citizens who own the airwaves and can now not see fit to use them for free." Japan perhaps has a different regulatory framework than the U.S.
Imagine a bill hitting the House of Representatives suddenly that proposed a consumer tax on Wi-Fi? I think the recall petition would be filled with signatures before the bill reached its second reading. The bill in Japan won't reach Parliament until 2005, at which point the legislators involved will probably have been voted out of office, or buried under tens of thousands of letters.