By the time of 50e (50th anniversary edition), I wonder if there will be a general consensus of what the prominent species are.
I mean, the top 3 (condensing variants together) have consistently been Human, Half-Elf, and Elf. So if you just want those, the consensus is already clear.
If you're willing to go top 5, it gets a bit murkier, but I'm fairly sure that would have settled on the aforementioned three, Dragonborn, and Tiefling--especially with Fizban's in the equation. Expanding out to top 10, the next few spots tend to vary a lot, but I'm fairly sure Dwarf and Halfling have usually been up there, and I
believe Half-orc is usually in the top 10 as well. The last couple vary a lot, but I want to say they tend to shuffle around between gnome, aasimar, firbolg, and...something else, don't recall off the top of my head.
So yeah. I strongly suspect that Dragonborn (if you combine the PHB version and the three Fizban's versions as one block) will very likely rise in popularity but only potentially in ranking, because Elf as a combined lineage is gonna be
hard to beat. The most popular 5-man-band party, in terms of races, assuming every player picks a truly unique lineage, will then be Human, Half-Elf, Elf, Dragonborn, and Tiefling, with a Dwarf as the optional 6th Ranger.