We're talking about a hypothetical future where total gasoline consumption is trending down. In that world, bitumen is no longer a waste product, and starts having to carry the price of extraction and pipeline cost. That would make new highways much more expensive.

The likelihood and timeframe of that future is a separate issue, and I'm not holding my breath. Even if Europe really does ban new ICEs in the the 2030s, there's a long tail to to it.