I can provide some good insight for last season, but I'm staying away from DV since then.
Last season I believe 7,500 was the advertised cap, but I'm not 100% certain because I only cared about actual numbers.
Basically every weekend and holiday was hitting 8,000 to 8,500. There's also plenty of uncounted numbers due to season and employee passes.
I remember when DV was great despite having somewhat mediocre terrain because powder lasted for days. Last year the powder was gone the day of the storm. Wasting an entire run to farm three whole powder turns does not count as a powder stash like a lot of people try and claim. I also thought the crowds could get pretty big at certain lifts, but you could avoid the worst lines if you knew what time of day to avoid them.
I'm sure that Alterra has upped the numbers for the cap and ANY increase will be easy to see in the lift lines without further resort expansion.
I personally didn't think they would ever allow snowboarders as that is the #1 thing people complained to DV about when Alterra took over, but they sacked their long time GM Bob Wheaton and replaced him with a career hotel guy, which seems monumentally stupid, so who knows what will happen from this point on.
I know from a leaked internal memo that DV is getting a lot of complaints this year. Regardless of Alterra buying them or not, Utah is getting so crowded that all those resorts have turned into a shit show that are easy access from the Wasatch Front. Lots of people that would hit the Cottonwoods no longer want to deal with a 4 hour commute just to get up the canyon and now they head to PC and DV.
I definitely miss what DV was 15-20 years ago. That time is long gone.