The problem that I see for governments is that their transactions need to be confirmed by Bitcoin miners. It's not a problem itself but just the fact that the government moving coin from one wallet to another and that transaction getting confirmed by a random miner looks funny to me. Anyways, I think that there will be a war on getting as much mining pools and miners locally as possible.
That would be fantastic for bitcoin's decentralization. I've been saying that we need more miners and mining pools in different jurisdictions that are independent from each other. If countries start adopting bitcoin as a reserve currency/asset and then also start growing their stake in the mining world, it would effectively improve bitcoin's decentralization.