NY1 has been on Optimum for years now. They only recently picked up the HD feed and moved NY1 to channel 8 to make way for the Optimum Channel

According to FTVLive, after the ND Kris Knutsen fired GDLA anchor Steve Edwards after allegations of sexual harassment against him, KTTV never recovered. From what it looked like KTTV dug itself into a hole it couldn't get out of.

Alex still does traffic, but has also been a fill-in anchor when needed, primarily on the morning, noon and 5pm newscasts. She also anchors for CBSN New York as well as the national CBSN, typically hosting the 1pm ET- 5pm slot.

Before Alice bought Optimum, Cablevision back in 2013, laid off the entire on-air traffic team and switched to automated messages. http://tunedinnyc.com/2013/11/18/cablevisions-traffic-and-weather-makes-major-overhaul/ They would later simulcast select games from their high school sports network, News 12 Varsity and switched to infomercials overnight soon after Altice took over.

Starting on August 1st, News 12 Traffic and Weather will become the new News 12+. Here is a promo on the new channel

Here is a promo for the incoming News 12+

At the least the networks also own stations in the next market over, in Philadelphia. In the case of ABC, if things really went dire, they could get assistance from either their sister station in Philadelphia, WPVI 6ABC or their corporate cousins at ESPN in either their Bristol, CT studios or their South Street Seaport studios in Lower Manhattan, which was unaffected by the blackout. The blackout affected Fox News, since they were on Sixth Avenue but not WNYW, which is on East 67th Street. NBC also has studios in Wall Street for CNBC, if they couldn't make it to New Jersey. And if CBS ever needed some backup, Philadelphia sister station KYW 3 could pinch-hit. Fox could also rely on help from WTXF 29.

IIRC over on WNBC a few years ago, Lester Holt hosted the 6pm edition of News 4 New York on Thanksgiving with his son, 4pm and 11pm anchor, Stefan Holt.

Their Twitter handle @955PLJ is still up (as of June 1st, but who knows if it will still be up) , but the last tweet was the sign-off from Todd and Jayne. One of the studios who did jingles for them, TM Studios, saluted PLJ

Per the NY Post, CTM seems to be clicking with viewers https://nypost.com/2019/05/29/gayle-king-already-a-ratings-a-success-for-cbs-this-morning/?_ga=2.93574365.1157626706.1559208938-amp-MSambGDh_qw5Tt1wjXe6Fg

News 12 previously did have a Spanish-language newscast for its News 12 Interactive service. It was done for their Bronx and New Jersey stations. The experiment ended in 2013/14. Here is a 2012 News 12 The Bronx en Español segment