Literally the worst idea ever. Anyone who remotely supports this other than a OOTer whose hopeful to get to see his team is an idiot. I can't even believe it's been touted as a possibility, as everyone knows how monumentally fucked up it is.
How monumentally fucked up is it ??
So you may have to face a good club, or you may get an easy game ... shit happens ... sucks to be you if one game costs you relegation.
Why not have it as the first game of the season ... then if you lose, you still have 38 to dig yourself out of that monumental 3 point loss

If it's the first game of the season, you could even pad in some travel time so everyone can recover from that 4 - 10 hour flight as opposed to the however many hours of clubbing/drinking after their game that so many do now.
And, if it means you get to generate a million euros of extra revenue in overseas sales of kit/souveniers/TV/whatever, maybe it's the difference to signing the next Torres, or seeing him go to Barca.
Quite frankly, other than parity of schedule .... I've yet to see a real downside to the notion of a 39th game that cannot be at least compromised, and even the parity of schedule, over the course of 10 years would even out.