It depends upon the segment of memorabilia we're talking about. Game-used items continue to escalate (a lot). Quality autographed items as well... The autographed balls in REA went nuts in overtime.... I think the Heilmann Ball jumped from $800 to $35,000 ($42K with the juice).
And the McGraw, Maranville, Hamilton and Averill Balls may have all broken records as well.
There was weakness among the figural type pieces... The Southland Bronzes, Bobbleheads and Walter Johnson Statue floundered a bit. The Johnson Statue was missing its base, but still went cheaper than in past sales. There were not many pennants, but the ones they had did just okay, IMO. Not sure about Tickets and Programs, as they aren't my wheelhouse. But sounds like they've declined a significant bit.
So there's a wide array of "stuff" that makes up the memorabilia segment... some is thriving; some not so much.