I want to know real world use cases of segwit, it seems like segwit is similar to 3D Tv technology which though is improvement in TV technology but in reality very few users will actually use it.

Most bitcoin transactions are generally one time like: User withdraws money from any exchange/website or User buys something using bitcoin online or user buys a service using bitcoin. I dont understand how segwit/lightening can be used in this general usecase. Some services are paid monthly but is the lightening network developed for such cases to keep the payment channel open for a month?

Thus it seems segwit/lightening  is not useful in most transactions, so though theoretically it should reduce the number of bitcoin transactions but in reality it will not make much difference to the actual number of transactions because it does not cover most common bitcoin use-cases and completely useless for average bitcoin user.