This is not good... South Korea, US and EU could follow Japan and this will lead to serious price drop.
They are just trying to ruin all alt-coins and collect taxes under the 'protecting customers'. I guess I will transfer all my coins to Monero and DeepOnion.
I don't really think this would be a problem. How could they "Ruin" altcoins by collecting taxes because the trading fees would be the same for all the coins. Unless they increase the trading fee and withdrawal charges I don't think they will be ruining any coins. Japan would surely be the largest bitcoin exchange as the Chinese have shut down exchanges. Japan is taking a step towards rectifying any future bugs through its active inspection and that wouldn't cause any increase in price. If there is an increase in price then whatever you said might be true. Let us wait and see what the result would be.
You have to trace back the history of Japan's Financial Services Authority (FSA - the agency responsible for monitoring bitcoin exchanges) attention on Bitcoin to understand the rationale of this move. It all started in 2014 with the Mt Gox debacle. Japan was caught offguard. Culturally even, this was a slap to their face, a deep embarassment for it to have happened right under their noses. That's when regulators started putting together this idea of regulating exchanges.
The main items on the early draft is evidence of this. Aims to ensure separation of client and company assets (Mt Gox stored bitcoins haphazardly, the CEO even later "found" a USB with a stash), protection against cyberattacks (Mt Gox claimed it was a hack), auditing (MtGox had terrible accounting).
Of course, it's not just all about preventing another Mt Gox, but that was what started Japan's move down this path.
In that context, it cannot be bad. If anything, this restores confidence for those burnt by the scandal. Japan also has insurers now offering cover for bitcoin exchanges, thanks to this regulatory action. Nothing is ruined.