There's no way to know. There are some features in 2.1 that the consoles could make use of, but there are also reason that these features could be useless.
With adaptive sync for example, the game needs to really be rendered at a much higher frame rate than currently consoles can manage to be useful. Historically consoles have not been powerful enough to render many games above 30fps so if that remains the case the usefulness of having adaptive sync when many TVs don't allow the use of it beneath 40fps is going to be useless.
Then there's the ability to output full a chromatic signal at 10 bit depth (HDMI 2.0 can only do 4:2:2 at 10bit) but that is not a format that is recognised by HDR10 spec, so its likely even when HDMI 2.1 is available to use, games will still run under a spec that remains fully supported by HDMI 2.0.
Auto Low Latency Mode - well it helps lower input lag, but input lag on all TVs is already very low.
So I'd regard it as a nice-to-have, but not worth paying extra for. If you want to buy sooner rather than later then just forget about it, if you are willing to pay a bit extra come black friday or wait as much as 10 months from now to find the 2019 LGs as cheap as the current 2018 ones are then its worth waiting for.