With countries adopting bitcoin as legal tender side-by-side their fiat currency it's definitely going to make all types of trading transaction seamless for everyone. But even with the barriers that may exist from the government of any country towards bitcoin, intra trading transactions can still be successfully processed and achieve among different traders from different locations provided there an already built trust that exists between the traders and they both agree to transact using bitcoin then it's a done deal whether or not bitcoin is a legal tender in that country.
It is commonplace when both parties have a wiser agreement and do not harm each other, but for now I think it would be very unfortunate if certain parties are more willing to spend Bitcoin than to keep it in a safe place and use others to support any activity. Because Bitcoin which is already quite expensive should be considered as an important asset which does not have to be spent on any transaction even though it can be done by any country at this time.
I think people who love Bitcoin more will not immediately use Bitcoin in any transaction if they can still use other tools such as fiat to do the same thing. Because everyone can use fiat to exchange it for anything as long as it is still possible for him, but if someone uses Bitcoin to exchange it for a certain item, I think that person will regret it very much when he sees the price of Bitcoin which has become more expensive in the future. So this option must be really thought out wisely before being done because throwing away fiat for something else will not be a loss, but throwing away Bitcoin just for something that can still be obtained with fiat is a very loss-making action in my opinion.