The thing is that ever since Bosman's ruling, the gap between the top clubs and the bottom clubs in every league has steadily grown, making it easier for the strikers playing in top clubs to score.
Away games were almost always a huge struggle for every top club, even if they were facing a relegation side, and averaging 66.67% of the points (winning the home games, drawing the away games) usually meant you were on the right track to winning the league title. And the bottom teams almost always needed around 42-43 points to avoid the drop.
And the same imbalances have appeared in the CL/EL, where back in the day nations like Romania, Belgium, Yugoslavia, Czechoslovakia, USSR, Austria, Hungary, Sweden, Scotland, etc have all produced champions and finalists in at least 1 of the 3 major UEFA competitions. Now these games are usually a walkover for the clubs playing in top leagues. And other countries like Portugal or Netherlands, almost always had world class teams, while nowadays they are lucky if the reach CL quarters (it's even worse for the dutch, which I'd say are lucky if they make it past the groups).
These imbalances don't apply to international games, so of course we're not going to see drastic improvement in the goal scoring ratios.