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Yes, but even if the block time is longer, the probability that I will "win" the block goes up. Someone has to mine the block and if half of the competition goes away my chances go up. This incentive will counter the temptation to stop mining, dampening the effect you mention.

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Miners don't compete directly to "win" blocks. If everyone except a single miner stopped mining right now, that last miner would mine 100% of the blocks. However, they'd still make exactly the same amount of bitcoins as if everyone else was still mining - until the next difficulty adjustment

I see. Thanks

Is there a good reason for the difficulty adjustment period being 2016 blocks? What would be the consequences of reducing this number?

I'm not sure what the reasoning is, but to be honest I don't think it's a good system. Block time averages have been about 9m30 since bitcoin's inception, so it's clearly not good enough to properly target 10min/block

When bitcoin cash forked they changed the period to 144 blocks (along with some other changes i believe?), so they have a much smoother difficulty graph.

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