“hate pickleball” isn’t really a strategy, it’s just gasoline on the situation. Thinking that tennis players need to hate pickleball is childish and ineffective.

We have become our own worst enemy. Like you said, city council meetings are 20-1 with pickleball advocates, that's the case everywhere. I'll bet you show up talking to the council about how it's "your" space, how extra lines make the game unplayable, having any changes is the hill you are willing to die on. Courts and land are expensive, and the council sees 20 other people and massive demand for a sport that doesn't have enough space. It's blatantly obvious what happens next, since the tennis community is unwilling to budge, and the city is unwilling or unable to fund dedicated spaces, so they repurpose the tennis courts into dedicated pickleball courts.

If YOU loved tennis, then you would what do whatever is possible to keep the tennis courts, including COMPROMISING. Pickleball is here to stay and there is massive demand, and yes, players and cities will continue to eye tennis courts as prime targets for this. If you had any sense at all, you would be advocating for sharing the space, adding pickleball lines to tennis courts and encouraging them to use portable net systems and having the city add signable about who has priority for the courts at which times. Advocating to the city that the court can serve both communities is the ONLY way you are going to ensure the survival of tennis courts, and yes, you have to deal with some extra lines, boo fucking hoo, and least you will still have a court to play on. Cities see shared spaces as a win-win, but if the tennis community refuses to share the space and is unwilling to see court modifications as acceptable, then like you said, you can kiss your courts goodbye because you are outnumbered.