This could either be a game being released at the right time, certain developers meeting, a game being of a certain quality that changed everything, a console being released, a service being introduced, etc. It's what YOU consider the number one perfect storm that stands out in a medium full of them.
For me, it HAS to be the launch of the Playstation 2. It was being released in the new millennium right on the heels of one of the strongest periods of economic prosperity for the West thanks to the tech revolution, where its predecessor revolutionized the industry with use of disks, where it was immediately the cheapest DVD player on the market, along with dozens upon dozens of "mid-tier" developers popping up overnight practically. THEN on top of outclassing the Dreamcast in almost every way (online functionality is a bit debatable), the MS and Nintendo didn't release their consoles until a year later, while SEGA went third party, and on top of THAT, you have 2001 being a barrage of revolutionary exclusives in a variety of genres. It was complete and total madness.
For me, it HAS to be the launch of the Playstation 2. It was being released in the new millennium right on the heels of one of the strongest periods of economic prosperity for the West thanks to the tech revolution, where its predecessor revolutionized the industry with use of disks, where it was immediately the cheapest DVD player on the market, along with dozens upon dozens of "mid-tier" developers popping up overnight practically. THEN on top of outclassing the Dreamcast in almost every way (online functionality is a bit debatable), the MS and Nintendo didn't release their consoles until a year later, while SEGA went third party, and on top of THAT, you have 2001 being a barrage of revolutionary exclusives in a variety of genres. It was complete and total madness.