Bluetracker
Tracks Blizzard employees across various accounts.
Question: How many games need I to play Ranked/TL so its rating overwrites my QM/UR rating?
I have read in the past that the mm will take the "next best" one.. but how many games do I need to play so it won't reset next seasons? 15 games?
Loesby
You don't need to skip a season, just play less than 15 games this coming season and it will re-seed in 2018 Season 2.
I'm assuming, since you ask this, that you don't feel your current Rank/Skill Rating match your actual skill at the game. If that's true, then I hope you do play Hero League this coming season and give feedback, because you're exactly the kind of person the changes are meant to help. If you're not, well... I still hope you play. The most effective way to get a better rank, and get better at the game, is to play more.
Loesby
It's definitely possible to learn bad habits playing at lower skill levels. However, if you're looking to get better, playing anything at all is a better strategy than not playing.