Difficulty per se is not affected by your expansions or AW levels. Just like with any other fighting in this game, it is only affected by the ratio of your own SS vs enemy's, boosts, troops lineup and the terrain. None of that depends on expansions / AW levels (BTW, you can't have 216 expansions )I just have 1 questions about the new system. Let's say when it starts, next week, with my 114 expansions and 172 wonder levels I can do 2k points. What happens when I have 216 extensions and 215 or 250 WL? Will I still be able to do the 2k or will even that be difficult/impossible?
What is impacted is your ability to recover troops and goods. So your city progress won't make any of the individual fights unwinnable if they were winnable before, but it may prevent you from reaching the same overall level in the tournament consistently.
For the SS/catering calculation you can use https://minmaxgame.com/tournament-requirements-calculation/ (there is also a link to a spreadsheet calculator). This does not incorporate their most recent changes to expansions, but this change seems to be fairly insignificant.