Yeah, segwit only has somewhere between 40-45% percent but that alone would not be enough for cases like this or for the future, imagine doubling usage, even with segwit it won't be possible, the solution is to move to a second layer, but that at this point seems ten times harder for new users than simply using bitcoin, and for most people out there even this is quite a hurdle.
Well, I guess something will need to be done at one point. The usage will inevitably increase anyway, especially at the market expands and Bitcoin matures. By second layer, do you mean LN? Would that be a working solution that could work at a large scale while also preserving the main aspects of Bitcoin, such as decentralization?