In the latest announcement for Battlegrounds changes for Season 8, Kabam announced a change to how many medals players earn per win and how many medals it takes to promote for the Victory track changes. The obvious question is: how much better is it now?
Answer: depending on what your average win rate was/is in BG, a lot.
First, here's a comparison between how many matches it took, on average, to promote a VT tier depending on your average win rate (this would be the average percentage of matches you win) looking at the current Season 7 numbers and the announced Season 8 numbers:

(Note: the number in the parentheses is the number of medals required, and the number after the x is the total number of tracks in that tier with that medal requirement. "Silver (3) x3 means Silver tracks require three medals, and there's three of them. Gold(5) x3 means five medals are required Gold tracks and there are three of them.)
For Diamond tracks and higher the numbers are identical, because the medals won/lost and medals necessary are unchanged. But the number of matches it will take for everyone drops in S8, and it drops most dramatically for players at or below 50% win rate until Platinum 1. Note: these numbers are calculated computationally, using statistical models. But as I ran them for about eight million iterations, they should be accurate to more decimal places than shown.
As indicated, even though Gold tracks increase from requiring three medals to five, the medal increase still allows for much faster progress through the track. Had Gold and Platinum been kept at three, it would have been far too easy to promote through those tracks. Instead, Bronze and Silver are far easier to promote through, and Gold and Platinum are still much easier, but slightly harder than Bronze and Silver.
For those who would rather see this graphically, here's a comparison between the average trajectory for a player that wins 50% of their matches, comparing Season 7 and Season 8:

And a player with only a 33% win percentage rate:

The difference is huge up to Platinum 1. Even stronger players will be accelerated through VT at a slightly faster rate on average, but as they were blowing through VT very fast already, there's very little room for improvement. But for players that were getting "stuck" in VT, the Season 8 medal mechanics will offer substantial benefits.
It should also be noted that unlike in S7 where it was theoretically possible for a player who actually won 50% of their matches to still get stuck if they were unlucky enough to alternate wins and losses (which would keep zeroing out their trophies) in S8 alternating between wins and losses will still net one medal every two matches. Such a win rate gets you through Bronze tiers in four matches (per tier), Silver in six, and Gold in ten. And that's the worst case scenario for a 50% player. A 33% player can theoretically get stuck if they consistently win one and lose two in perfect sequence, but anyone with a higher win percentage is guaranteed to progress upward at some slow rate.
So: its better. A little better for the strong players with high win rates who didn't need help anyway, but it is also no worse for them, even with the higher requirements for Gold and Platinum. Much better for average players with about 50/50 win rates, who can no longer get stuck with alternating win/loss patterns and who will also, on average, promote much faster (even through Gold and Platinum) until they reach Diamond. And for weaker players who were getting crushed, the new medal situation will in most cases be a god-send. It will allow them to progress to a much higher degree. Maybe not all the way to Diamond, but more than before depending on how many matches they play. For example, a weaker player that did fifty matches in S7 might still find themselves only in Bronze 1, statistically speaking that same player could find themselves in Gold 3 in Season 8.
For those wondering, it would be difficult to compare this change to
my suggested medal change, but it is in the general ball park of what I suggested in overall impact. It is slightly better in some respects, not as good in others, but probably materially similar.
Also for reference: my original analysis of
how hard it was/is to promote through the VT with the current medal mechanics.