The market will take care of this. The reason we use bitumen now is not because it's the best for the job. We use it because it is cheap. There are other option

The market will take care of this. The reason we use bitumen now is not because it's the best for the job. We use it because it is cheap. There are other options that are better like cement that last longer. Will the material cost of building roads go up? Probably. Will we be unable to build roads at all? Probably not. There are also plant based alternatives being researched like Lignin and crystalized salt.