1) Yes. If you report low taxes but live a good lifestyle the tax man is coming after you.
2) Excrow... ever heard of cash. Thinking that cash is less anonymous than bitcoin is totally off base.
3) why 1%? You give no reason.. if most businesses dont accept it nobody will want your bitcoins
4) It wont become big as large, medium and small businesses wont accept it.
Sry but I feel like talking to a wall here.
1) Your all knowing tax man knows how much I spent on my household appliances and that I'm having fun with whores every night. He must be a god :O
2) Not excrow but escrow. Try paying someone living in another town with cash - you are planning to mail it to him, right?
3) I said 1% to pick the smallest number so you won't go "why 50%? nobody pays 50% for virtual goods and services". It can be even more but 1 could be enough.
4) They will, it's just a matter of time. There are many possiblilities one of which is BTC functioning along fiat, so you could freely exchange it and pay your taxes with fiat.