Now the sluggishness of bitcoin and the high cost of its transactions should be a thing of the past, since a new version of Bitcoin 0.16.0, which fully supports SegWit, has recently been released, and therefore it must quickly eliminate its shortcomings. If at least part of the lightning network is introduced into the bitcoin, it will soon be possible to buy a cup of coffee with bitcoin, and the cost of transactions will be almost zero.
Sure, that's the hope. In the meanwhile, transaction fees have at least come down to a more manageable $2 USD or so. Not low enough to enable "buying a cup of coffee", but certainly better than the $30 - $50 fees of a couple months ago.