Supergirl : How long could the 4 DC shows last?

How long could the 4 DC shows last?

http://tvseriesfinale.com/tv-show/supergirl-season-two-ratings/
http://tvseriesfinale.com/tv-show/the-flash-season-three-ratings/
http://tvseriesfinale.com/tv-show/arrow-tv-show-cw-season-five-ratings/
http://tvseriesfinale.com/tv-show/dcs-legends-tomorrow-season-two-ratings/

Now that all 4 DC shows on the CW are back after an almost 2 month hiatus, and some of us have seen what their ratings have been like, how long do y'all think they can go based on how things are going for them now? I can see Arrow getting at least one more season, LOT 2-3 more, and Supergirl and the Flash making it to at least 5-6.

Re: How long could the 4 DC shows last?

Depending on the quality of the shows I can see

Arrow (Another 1 or 2 seasons depending on the quality of the second half of Season 5)
The Flash (Another 3 or 4 seasons)
Supergirl (Another 4 Seasons)
Legends of Tomorrow (Cancelled after Season 3 and replaced with new superhero show)

And

Gotham (Another 2 or 3 seasons)
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