They've already done a decent job addressing the difficulty so far. The 9 star hunter are about as strong as anything high rank usually would be. Low rank was ridiculous due to the wounds, but with their massively reduced frequency high rank isn't bad, and master rank would likely reduce them even more.
In fact, that combined with further scaling master rank in wilds will likely be one of the hardest in the series.
But if they don't have performance fixed by then no one's going to bother buying it.
Less than a year after its release date, the Monster Hunter Wilds price has plummeted in some countries. Japanese buyers can score a used copy of the Capcom game for $3 or less. A Monster Hunter Wilds Switch 2 version may boost its popularity, but performance isn't the only concern for players.