Why not both? Honestly, I don't think online would die out even if the lockdown experience was to be completely removed. It just opened up a whole new idea for most players that they can well, gamble in their homes. Same could be said with offline, even if online exists I hardly doubt it would actually die out, they both have their own characteristics and both would have their own niche market. VR, if it is actually implemented properly, would take both characteristics into one, though that's still far off imo since replicating all senses in VR would still take time.
Both online and offline look like a booming business right now. However you'd think that, especially with the Covid situation, it has proved that many more people are able to work from home. That brings up a lot of opportunities for online businesses to capture new customers. On a different note, I expect we'll start to see a lot more electric-driven sports going on in future, which will feed into sports books. Eventually the combustion engine will be a thing of the past, it's going to be quiet eery watching E1 racing in near silence. I expect we'll also start to see more drone driven experiences, there are already competitions going on involving all kinds of drone racing and they will capture bigger audiences in future - it is a highly skilled game.