What changes will bitcoin undergo in the future?

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Other than the mining rewards and size of the data that will be stored on any given node… what can users expect to change about the protocol and actual bitcoin infrastructure?

Mass adoption obviously comes with more external infrastructure to support use and exchange. But when that time comes will everyone have to use lightning ? Transaction times are much too long to expect bitcoin in its current state to replace a credit card in a shopping situation … so is lightning the final solution to that ?