I've benefitted from having an NFL UK season ticket for several years now, but I'd say that the La Liga situation is different to that. The NFL represents the only professional league (at least that anyone cares about) within the sport, which is why the Superbowl winners each year always anoint themselves as 'World Champions'. The international series, which has been extended again this year to include an opening week game in Brazil is a means by which the one professional league is taken to fans around the world. Season ticket holders from the US attend the games in significant numbers, on organised travel trips, and the fans that I interact with generally enjoy the novelty experience of seeing their team play in another country. La Liga is a standalone national league for a worldwide game where pretty much every country, including the US, has it's own version of them. The sport is well established and there are meaningful international competitions between the leagues, at both club and country level. Taking games into another territory where an existing league already runs is a very different scenario. It's another nail in the coffin for football, if it happens. Other leagues will no doubt consider doing the same thing and there's be a steady trickle of games disappearing into other countries, no doubt including the sport-washing territories like Saudi Arabia. A decision purely driven by the greed of the ownership to squeeze more money out of owning a club.
In the USA model of sport the fan counts for nothing...teams move the franchise to wherever the money is without regard to supporters wishes. The fact that they do it in US business franchises does not in any way make it right or desirable for a Football Club to follow the same model.
Imagine Liverpool are fighting Manchester United (or City given their recent rivalry has exploded) for the league, it's the last game of the season and it's at Anfield. United just need a point, Liverpool need all 3 to win the league over United. Do you really think they'd give up home advantage for that? Fans would be fuming!
I bet the cost of the season ticket won't drop to take into account the game you lose. Fans will still have to pay the same for 18 home games instead of 19. It's wrong. Money rules the game and it's not making it better.