Do you have any sources for what you're claiming? Because you make it sound like ever game that isn't a PC exclusive bombs on PC...
I'm not saying that's true, I'm saying that's what publishers think it happens, because they're idiots and think a game pirated is a sale lost.
They don't care that we want a game on PC. Even if they break even porting the game and all of us getting it, that's not a good investment.
I'll use a very dumbed down argument: Let's say they spend 100000 dollars to port the game to PC. They would have to sell 1666 copies of it, at 60, to recoup that costs. Let's say they sell 2000 copies of it. Let's say a Torrent of it gets 5000 downloads.
They'll see those 5000 downloads as "lost sales", because the PC market doesn't have reliable piracy countermeasures, blablabla.
I'm pretty sure any investor would rather use those 100000 dollars to create/fund a new console game, that has a installed base of 10 million possible consumers and anti-piracy measures in place.
The thing is, they have a solid number of people that would theoretically buy the game, from the petition. If I were a investor, I would use that number as a base for copies sold, and plan the porting costs accordingly. (obviously I would project some sales ahead, but that petition is, for better or for worse, a possible stream revenue)
But, again, as you said, I have no source or investor background. I'm just weighing in my opinion.
I also think it's impossible the game will have a locked resolution. I actually think it would be harder to code that in than to just create a half-assed screen resolution selection screen.