I agree with all of your points, for the most part -- with two exceptions:
Firstly, it is, for the present, more challenging to buy bitcoin anonymously than your text suggests. Even an easy, effective anonymous currency does not suffice to make it easy to buy bitcoin with reliable and effective anonymity.
Secondly, I think that for quite some time the valid theoretical point of Gresham's Law is largely irrelevant, in practical terms, because the overwhelming barrier to use of crypto as currency is lack of infrastructure and vendor support, next to which all other considerations are secondary. (And which renders crypto useful only for a very special class of typically very high value or else crucially private transaction, where Gresham's Law doesn't really apply.)
Both of these conditions are accidents of history, and will hopefully change in the future, but while they pertain, they do bear strongly on the desirability of an anonymous coin as a value store.
The biggest reason why it would be well for Monero not to commit to a perpetual debasement just yet is that the decision may have irreversible impact detrimental to the establishment of the coin. Gresham's Law works in favor of the increased adoption of a deflationary currency during times such as we are presently in, times when infrastructure does not allow the quotidian use of crypto. It only works against the purpose of facilitating anonymous transactions when, in the hypothetical future, infrastructure is sufficient to allow reliance on Monero for general transactions.
Hoarding is part of the PR, as is price appreciation. If you are debasing early, you tend to lose value early, which turns people away from the coin. BTC is much more usable than DOGE, presently, for example, which is in serious decline and unlikely to recover a growth trajectory, whereas BTC has never lost its exponential growth momentum despite a price collapse, in part because it is deflationary. I.e. the empirical evidence at present is contradictory to Gresham's Law, and I claim this is because of the immaturity of infrastructure, but will change eventually, to bear out Gresham.
For these reasons, I would suggest that any persistent debasement be tied to the number of active transactors in the ecosystem, e.g. a 7-day moving average. If the number is stable or declines over time, debasement should be nil. If the number is increasing, debasement should kick in. If the number is accelerating, debasement should accelerate. But even that is premature until infrastructure exists to support an economy, so I would suggest another factor, to threshold at some level of activity indicative of a working bootstrap.
The result of such a policy should be enhanced price stability: The value of a currency scales as the square of the number of transactors in the economy. Price deviates from value due to exogenous factors, but converges to a mean which approximates the value increasingly well over time. If you adjust issuance in accordance with value, price will tend to adjust along with it.