20XX
The year when something becomes completely optimized due to being so far into the future.
In the year 20XX everyone plays fox. The Melee players of the future convene in holo-New Jersey to decide the ultimate Smash champion at APEX 20XX. Will it be the immortal Mecha-M2K, Mango Jr., or PewPewU who is just turning 21?
20XX
The hypothetical year in which players play perfectly and where the winner is determined by other factors than skill.
The year is 20XX. Everyone plays Fox at TAS levels of perfection. Because of this, the winner of a match depends solely on port priority. The RPS metagame has evolved to ridiculous levels due to it being the only remaining factor to decide matches.
Windows 20XX
The version of Windows where Microsoft replaces the Windows Kernel is fully replaced by the Linux Kernel and Windows just becomes another Linux distribution with a fancy Windows skin. WINE and Powershell will also be integrated out of the box to try to convince people it is still Windows.
Person 1 "Wow can you believe Microsoft finally made Windows stable with Windows 20XX. I haven't had a blue screen in weeks!"
Person 2 "That's because you're using Linux."
Person 1 "What's Linux?"
Person 2 "BTW I use Arch."
Person 2 "That's because you're using Linux."
Person 1 "What's Linux?"
Person 2 "BTW I use Arch."