This isn't a blockchain level change, it's a feature that has to directly supported by frontend post browsers and that is how it was done in the past by condenser. I think Steemit probably removed it from condenser because the view counts wouldn't report accurate view counts when an article is being viewed across multiple frontend browsers, making view counts overly pessimistic.

I suppose in theory, frontends could periodically report their own view counts via the blockchain and aggregate the view counts that way. This would still depend on the frontends to all report their view counts, of course. And it could add a lot of overhead to the blockchain data, depending on how often such reports were made.

Another possibility would be to add some kind of peer-to-peer sharing of the viewing data between frontend browsers via a 2nd layer service such as hivemind, and this latter approach wouldn't add any blockchain bloat.