I do not think it will ever happen to bitcoin global regulation, because there will always be an incoherence between the rules of each state .. because bitcoin and crypto are the greatest opportunities for getting clappers, and that's what causes each country to have different rules about regulation bitcoin
Exactly, every country have their own belief about cryptocurrency but I think its good to have a global regulations so we can be more confident that they regulate cryptocurrency for the sake of both investors and a company. More countries will support this technology and I do hope G20 summit is the way to make that happen.
Every country will always do. Some will regulate, some will not but will also not bother about it, while some may not regulate, you will still be subject to capital gain tax and some will actually still stay adamant about it. I feel however that most countries will come around and in their own way, accept bitcoin and cryptocurrency for what they are rather than attacking it.
After some point of time, governments may start realizing the fact of no big differences they can find due to regulations of crypto currencies. Because regulations may give negative impact in short term but in long term it will help more people to adopt cryptos. Then people will start exchanging within themselves to avoid governments interventions.