How has Mercutio's quote 'A plague on both your houses' predicted the future in ' Romeo and Juliet'?Explain and give evidence

Mercutio's quote "a plague o'er both your houses" predicts
future events in several ways.  For one thing, it highlights the consequences of the
feuding.  Of course, Mercutio probably wasn't the first and will not be the last to die
because of the bitter tension between the two families.  Mercutio's quote foreshadows a
continuing of aggressions.  While he doesn't know that Romeo has a reason to stop the
fighting, he sees the high price of the feuding.  Eventually, Romeo will kill Tybalt and
bring about his own exile.  The death of Mercutio marks the downturn of Romeo and
Juliet.  In the end, the plague of hatred destroys both houses and "heaven finds means
to kill your joys with love...all are punish'd."