LN doesn’t have to be ready. Payment channels are much easier to deploy and understand (and thus trust). Significant reduction in transaction volume can be achieved with a little cooperation by the Bitcoin companies causing most of the transaction volume in the network currently.

Yes, it’s a centralized solution, but it frees up space in the blockchain for those who don’t want to use the centralized solution, so it benefits everyone.

It’s perfectly plausible to get payment channel support into the most popular wallets by the time SegWit activates.