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Assume you are a business. You only sell against bitcoin, but the bills (eg electricity, web hosting, wages, taxes etc) are in USD, so you will need to exchange the btc income for usd and move that usd to your bank account to pay the bills. The regulator can force banks not to accept any usd tranfers from any cryptoexchange without proof of providence.
I get your point, if you actually withdraw money from the exchange into your bank account, you are bound to be caught and taxed one day. However, there are other ways to exchange Bitcoin and cryptocurrencies, via face-to-face deals, this is the minority though to be honest but my point is that it can still be bypassed. If these regulations do pass, then they will probably start catching up most of the transactions/money laundering coming through banks.
You are right that it can be bypassed, but not in a scalable, maintainable way. Let's be honest, if we only talk about the occasional transaction, then there is no problem with regulation, but the cryptos will remain an unimportant toy. As soon as you want to run a serious business, or as soon as you want the majority of your income come from cryptos, these alternative channels will quickly become inoperable.
Also, even if you are able to accumulate wealth outside of a regulated system, it would be immensely difficult to use that wealth. The reintegration of the usd you managed to pull out of crypto will be made difficult, as at some point questions about the source of the money would arise inevitably.
Thus, I just don't see a way around it.