short answer, probably never
shorter answer, soon.

long answer,

There is no block size issue. Nothing is broken. there is a TX limit that is self imposed by the network because of the theoretical TX limit , which, if reached node centralization will occur ( altho there is a group of poeple that beleive node centralization was always part of the plan) , this limit is based on the internet speeds/bandwidth incurred by nodes.

this limit is meaningless for "private off-chain bitcoin TX" ( aka Lighting Network ), the current Lighting Network is in dev, i know of 2 project which aim to bring a second layer to bitcoin which will have practically no limit. they both depend on segwit implementation to be widely adopted. I believe segwit will take time to be widely adopted maybe a year, and by then the Lighting Network will be in great shape.

so in ~1year it should all come together and we'd see headlines like " bitcoin adopts new TX layer, which allows it to handle >100,000TX/sex ".