I have a good stash of miles too, and yes, I've noticed that availability for 11 months from now looks great. But IMHO only a fool would book anything - no matter what currency you're using to pay for it (dollars or miles) - anytime in the foreseeable future, and that includes 11 months out. It's simply impossible to know when travel as we have known it will be possible again. If you can make a highly speculative booking, with 100% certainty that you can cancel with zero fees, then there's nothing wrong with dreaming. But I don't believe that's the case: even when booking using airline miles, virtually all airlines have non-trivial fees to make changes to your booking or to cancel and redeposit the miles. Those fees can be surprisingly high ($100 to $200 per ticket are common) and add up quick for round-trips with multiple travelers (if you have high-level elite status with an airline, you may be able to dodge at least some of the fees, but for most folks this is a real consideration).
Yeah, it's tempting. If you have the miles (I do), you see the availability (I do too) and you starting guessing about when things will be OK again (I have, but I've stopped). But there's no way I'm going to book anything until we have some real-world, evidence-based reasons to believe that travel will be available again on any given date. YMMV.