I expect this will be around the time that websites are no longer a thing and we see companies directly pumping information into AI agents which are then postured as the only mechanism for receiving certain information.
As an example, imagine Fandango becoming such a powerful movie agent that theaters no longer need websites. You don't ask it questions. Instead, it notifies YOU based on what it knows about your schedule, your preferences, your income, etc. Right around 5pm it says "Hey did you know F1 is showing down the street from you at Regal Cinema in IMAX tonight at 7:30? That will give you time to finish your 30 minute commute and pickup your girlfriend! Want me to send her a notification that you want to do this?"
People install a litany of agents on their smartphones, and they train their agents based on their personal preferences etc, and the agents then become the advertisers directly feeding relevant and timely information to you that maximizes your spend.
MCP will probably kill the web as we know it.