I'm not certain it is that high. According to Visa, they can only handle 65k tps. https://usa.visa.com/dam/VCOM/download/corporate/media/visanet-technology/aboutvisafactsheet.pdf. A p2p network is usually less efficient than a centralized network, so I suspect lightning to be slightly less. However, Visa does not even go near their capacity at any time. LN will probably be able to handle more than enough to be competitive. The main hurdle LN is experiencing atm is it is far from being safe for idiots. In fact, someone should only tinker with it if their computer literacy skills are on at least a computer help desk employee level.