With people mining all the time and generating money for their needs, and sure bitcoinshe can thus improve the economy, the government need not worry about employment rates since it's going to go down.
A number of miners in some country specifically outside China aren't really that big and also, it needs a really good rig to make a pretty decent profit out of this business. By seeing that, it's crystal clear that the mining activity doesn't give affect that much towards countries' economic and will seem not to improve it even a little. Assuming the earning from mining activities is considered as the same as earning from the internet, other sources of money such as youtube or google ads will far surpass the profit of the mining.