I am more than glad to hear that you are having these thoughts and realising the potential value of timeless posts, the "Moby Dicks" and "Iliads" of our time. It will be a huge incentive for those who don't just spend hours, but days and weeks on their thoughts and are reluctant to "produce for the trash bin".
How could it be implemented? Can Type I and II always be discerned upon conception?
If it is possible to adjust the payout time from 24 hrs to 12 and back and add one for the month, I imagine it is technically feasible to make it so that even years later a post - a classic which OOTL noobs constantly need to be pointed to for example - can catch an upvote still. Or maybe a "nouveau riche" powerful user stumbles over something valuable in the archives next year, maybe the Gini coefficient becomes more reasonable as reasonably active readers catch up on a 500-page Steemit webcomic...
Why not allow weekly or monthly... "pensions"? Nothing needs to be taken from anywhere else, just as the 30-day payouts don't "take from" the 12/24-hr payouts perceptibly and just leave away the whole curation award calculation, if I understand correctly: the ratio Type I/II upvotes will probably exceed 1 by far due to the curation incentives alone. No new module needs to be invented, no new pedestal be chiseled, just a restriction needs to be lifted, it seems...?
That announcement alone would already have made me quite curious and happy :) Who asks for much?
But now that you ask what it should be like to concentrate on such content first and foremost...
...then one form of curation would be for some, myself included, in becoming archivars, data snorkels, archaelogist who dig deep into the forgotten and lost to unearth gems and treasure of never beheld beauty.
It does not have to be the same scheme as in the 24h run, but let's say a mole finds this 5-year old heart-gripping soul-ripping post that sat at 4 upvotes and .02 $ all the time and it suddenly explodes over the next few weeks, this digger objectively did some great work.
That would be my first thought, I think.