Optane was still cheaper than DRAM modules of same capacity. And were twice larger for same price.
Really, I dream of Optane as a "super-fast swap drive" that "extends" RAM (that is what some manufacturers do with NVMe this days). Then it will be ease to have notebook with 256G "RAM" with actual 16G of DRAM and 256G Optane swap. Most users will not notice any difference compared to actual 256G DRAM since Optane is fast enough to make application switch fast. At least my Google Chrome and Intellij Idea could live in peace in such setup, each eating many gigabytes "RAM" since I don't code and watch sites at the same microsecond.