No, they're trying to stop hoppers, and it's not ridiculous. It worked. Next time, don't hop.
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The reason why its a 2 day cool down is because they are battling for 2 days, that's how clan wars work. Once it has started, any new members that join cannot join mid battle due unbalancing sides. And besides, staying in your own clan can actually prevent this.
You didn't need to go to "a good clan" for clan wars. Your war is based mathematically on the collective of the clan, then it pairs you up with a clan that has similar stats.
You wouldn't have been at a disadvantage being in your previous clan.
For someone waiting SO LONG for clan wars, you didn't bother researching it at all it seems