Yeah, the likely end of Act-age is a big loss right now, it was one of their three top next generation hits with still lots of potential growth. Once WNL is gone in December, we'll only have 6 properly established series ongoing. barely more than a quarter of the magazine.
It won't drop below 6 since Mashle will almost certainly be a proper hit by the time CSM ends, but 6 is still a pretty bad number. Hopefully by that time we have Undead also firmly established and at least 3 other series growing well so that that magazine's not over half filled by uncertain newbies (not sure which of the current newbies it'd be though.
It's hard to see Yozakura becoming a real hit at this point (unless it suddenly brings out an incredible story arc), but there's genuinely a good chance that it'll just keep surviving long enough above the flops until it ends naturally (perhaps around the 3 year point or so, I can see 140-150 chapters being enough for the series).
Heck, perhaps even Agravity Boys is doing well enough right now to keep sticking around in the current state of the magazine.