I paid for the upgrade through a work account, some discretionary funds that would have otherwise expired, so it cost me nothing. I must admit, if it was coming out of my own pocket, I'd be a *lot* more hesitant to upgrade.
If I were you, I'd wait and see what a putative U3823 brings. The hope might be that an IPS-Black version of the panel is released, or perhaps a 38" OLED version of the panel from the AW3423, or perhaps adding higher refresh rates. After being stuck with 'standard' IPS for years in the Ultrasharp line, it seems like we are really at a tipping point where lots of new tech should be coming down the pipeline to really improve those little bits of performance.