That's the thing. As soon as Sony shows PS5 games they will control the narrative
Next generation starts when PS says it does, for many people
We both know how this works. This is a new generation. Microsoft OWNS the narrative right now. Actually, they've been quite bullish and very confident with each showing or info dump. And for good reason. You're totally correct that Sony could definitely show some games for the PS5 tomorrow (another hypothetical....) and have a huge impact on the narrative as it stands today.
But......I can guarantee whatever Sony shows, if they show anything will be met with pause because the new narrative, the new precedent has already been put in place. The pause is all Microsoft needs. They dont expect to immediately dominate the next console race. Their in this for the long game. But consider Sony has completely OWNED this entire generation. That's seven long years of ass kicking!
Microsoft has been nailing EVERYTHING so far with Sony quiet on the home front about their next gen agenda. They've created a pause for consideration and continue to do it. The pause is "opportunity". Even among loyal Sony fans. If I could show it visually, it would look something below. Forgive this exceedingly basic example:
Sony current domination (7 years)
"----------------------------------------------------| |----------------------------------"
The "-----" represents Sony's current dominance of the last 7 years.. The Gap represents the change in narrative by Xbox, positive news, interviews, Series X reveal, more powerful Hardware, new acquisitions, etc, with no real answers from Sony.
The gap represents a window of opportunity. A pause. It's slight, but its just enough to change things. That's all thats needed for Microsoft to come in strong and win back a shit load of gamers who jumped ship this current generation. As long as they keep nailing the message, nail the price and XGS brings 1st party bangers, that window of opportunity will widen.