He's Right!!!
So I've been doing some digging through the internet and I think I've finally come across evidence of Half-Life 3 actually being confirmed! So here's my logic..
So we know there has been HL1, Hl2, and HL2: Episode 1 & 2, HL: Blue Shift, and HL: Opposing Force = 6 installments into the series.
Then we want to take a look at Steam's workshop of Valve titles which consist of Source Filmmaker, Left 4 Dead 2, Gary's Mod, Team Fortress 2, Dota 2, CS: GO, and Portal 2 = 7.
From here we want to take a look at Gabe Newell who is currently 53 years old. We then want to add all Hal-Life titles with Steam Workshop Valve titles which = 13. Now we subtract the two so, 53 - 13 = 40.
Now we're going to look at Valve itself and when it was established which would be 1996. This, making Valve 17 years old.
What we want to do now is add Valve's age to our total number so far, 40 + 17 = 57.
We now take a look back at the rumored Half-Life (3). From here we take our total number and divide it by 3, 57 divided by 3 = 19.
Now we take a look at former co-founder of Valve, Mike Harrington. Examining his past jobs, he had worked at Valve, Picnik, Google, and his own company Massena = 4. We then subtract our total number from this, 19 - 4 = 15.
Finally, we add Half-Life's latest full fledged installment, Half-Life 2, and the rumored installment, Half-Life 3 = 5. We then divide this by our total number, 15 divided by 5 = 3.
Half-Life 3 Confirmed.
Brace yourselves.
also: