You can spend Bitcoin on whatever you want in the hundreds of thousands of merchants accepting it. Granted, Bitcoin's merchant adoption level is very low if we put it against the adoption level fiat payment services enjoy, but that will change slowly but surely. LN will shake things up when deployed globally, because it gets rid of three important obstacles;

1) transaction fees.
2) confirmation times.
3) transaction processing capability.

From there the only obstacles remaining are the volatility and the lacking will to spend. In case of the latter, I hope that the aforementioned 3 points will at least make them more comfortable spending instead of solely hoarding. Currently I can definitely understand that there is no real incentive to move away from traditional payment services, but that will change once LN gets embraced by merchants. LN's lower fees might even result in merchants getting rid of the product premiums due to the fees that CC's and other services charge, which merchants calculate in their prices.