A few more, including some more sports-related but will have TV-related effects--and of course, I could be way off on most of them:
--Tonight's Golden Globe awards will be among the worst-rated in the show's history.
--In an effort to improve NFL TV ratings for the 2018 season, the league allows CBS and Fox to both show doubleheaders (other than for blackouts) on Week 1, and then as the playoff push heats up, every week starting at Week 12 (Thanksgiving weekend) until the end of the season. With consideration of adding more dual CBS/Fox doubleheader weeks in 2019 (Week 1 and maybe all of November/December).
--During all their doubleheader weeks, CBS decides to officially blow off their 8E/7C show (which right now is "Wisdom of the Crowd," which will either move to another night or return after football season--with reruns airing on weeks CBS has early singleheaders in most markets), starting "60 Minutes" immediately after football/postgame and just having a longer edition until 9E/8C (maybe as an extension of their 50th anniversary, replay some classic stories/interviews, perhaps like a "Where Are They Now?" and/or classic Andy Rooney segments in the extra time).
--The NFL announces a third wild card game in each conference (AFC and NFC), starting after the 2019 season. Only the #1 seeds in each conference will have opening playoff weekend byes, and a total of 6 wild-card games the first weekend (3 each on Saturday and Sunday--including a Sunday night game competing against the Golden Globes). Again, ratings are the main consideration.
--MLB decides to "expand" their playoffs, but only by making the wild-card play-in games a Best-of-3 series in each league, starting in 2019. The team with "home-field advantage" will actually be hosting Games 2 and 3 (if necessary) in those series. The rest of the playoff format remains as is.
--The 2018 World Series and playoffs will be among the lowest-rated. Particularly with few large-market teams ending up making the playoffs. The NL Central will be won by a team with less than 90 wins--and sadly it will not be the Cubs this season (Cubs start strong, survive the "June swoon," but go into a horrible August slump that eventually costs them the division and any playoff berth, and overtaken by the Milwaukee Brewers for the NL Central crown. Cubs will still finish above .500, however).
--Meanwhile, the St. Louis Cardinals have their first losing record since 2007 (and only their second since 1999), but their division gets so down after the Cubs' slump that they are actually not mathematically eliminated from the division title until about a week before the end of the regular season. Also, the Miami Marlins in the NL and Detroit Tigers in the AL flirt with tying or breaking the 1962 Mets' 40-120 record and worst in MLB post-1900. I will also go on a limb and predict one of those two teams lose all of their Interleague games too.
--The World Series becomes a Fox small-market nightmare: Milwaukee Brewers vs. Cleveland Indians. In spite of these two cities' long WS droughts (Milwaukee experienced a World Championship with Hank Aaron and the Braves in 1957, but only one WS appearance for the Brewers and that was in the AL in 1982; of course Cleveland since 1948), and so much being made by Buck & Co. on Fox about those long droughts, their former American League "rivalry" (until Brewers/Selig went NL in 1998), plus both teams pulling major upsets in the playoffs (including Brewers over Nationals and Dodgers) to reach the Series. (And in spite of Fox being on VHF stations in Milwaukee and Cleveland, FWIW). And the series going the full 7 games and concluding on Halloween night. I will refrain from predicting a Series winner in this matchup.

Surprisingly, despite continued NFL ratings decline, Sunday Night Football beats World Series Game 5 in the ratings.