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I don't think it's the start of a decline. I think they're already mid-decline and picking up pace.
They nearly got knocked out in the previous round but Messi rescued them, there have been recruitment issues for the last few years which haven't got any better, and Zidane was close to being fired in September as Real have massively underperformed at times this year and Barca still trailed them.
It totally could be the start of a calamitous decline. I get that. Let's see how they do next season. Will they still be in decline if they win the league and have a good CL run?