It is already possible, but the incentive to do so is currently countered by the incentive to grab your own curation rewards. This counter incentive is being removed, and I don't disagree with that, but to suggest it will bring the best content to the top is utterly ridiculous. There will be increased incentive to vote for whales because whales have less incentive to vote themselves early. What we could do now and what we're incentivised to do are 2 different things.
RE: Blockchain Update 3: Hardfork 20 and Release 19.4 – AppBase, StatsD, and RocksDB