Both Star and Colors having much more hindi movies and Gec Channels so my opinion is after merger new company should make Colors Tv as secondary Hindi GEC with name Star Colors, because Star Plus having more viewers than Colors. Star Bharat should be shutdown. Colors Rishtey should revamp and rebrand as Bhojpuri GEC with name Star Rishtey because in Bhojpuri market there is only one GEC from big broadcaster in form of Zee Ganga. In Re-run show channel Star Utsav should be only channel carrying all old hindi shows of Star & Colors. In Hindi movie genre they should merge Star Gold & Colors Cineplex channels and Kept Single SD&HD channels for each category like Premium/Latest Bollywood, Classic Bollywood, South Indian Dubbed, Hollywood dubbed, and dedicated movie channel for DDFD. I think 4 to 5 movie channels in hindi is sufficient other should it will be successful to engage more viewers with no/less repetitive movies. Other excessive hindi movie channels should shutdown and license of this can utilize in other markets where they currently absent.
In Kannada market Star Suvarna and Colors Kannada both should continue as GEC by making either Suvarna as Main and Colors Kannada as Secondary or vice versa in terms of Viewership. Colors Kannada Cinema should merge with Suvarna Plus, so after this Suvarna Plus will have more titles also HD version of it also required because As of now Kannada is only market out of big 6 regional market where Star not having HD Movie channel also there is only one HD movie channel in form of Zee Picchar. (As Udaya Movies HD still not announced by Sun Network). Colors Super may revamp and rebrand as re-run/dubbed content gec with name Suvarna Super and it should launched on DDFD because there is no any kannada channel available on DDFD other than DD Chandana.
In Marathi Star Pravah is king so obviously it should be main GEC and Colors Marathi should be secondary GEC. And I am sure after merger, Star Pravah's business head may took charge of Colors Marathi and will push heard to increase it's rating. Both channels will push Zee Marathi to third spot. Also in marathi Star should launch dedicated channel for music, re-run (specially for DDFD) and dubbed content.
In gujarati Colors is only channel so HD version for both GEC & Movies channel is required.
In Tamil Colors Tamil may merge in Vijay tv because I think, there is no any much ratings channel have. Same thing is applicable for Colors Odia. Instead of shutdown Colors Odia may revamp & rebrand as Star Kiran Movies.
in Bangla same thing like Kannada & Marathi, Colors Bangla will continue either as secondary GEC or make it as Re-run/dubbed content channel and make available on DDFD. Colors bangla cinema should merge in Jalsha Movies.
in Telugu and Malayalam there is no colors exist so there no any questions to merging or revamping channels.
After Company merger Star should enter in new markets like Punjabi, Bhojpuri, Assamese by shutdown excessive hindi channels and use licenses in those new market. It will be gainful for the company as whole india tv leader.
So this is my opinion.
Note:- I here mention Colors brand should renamed as Star because new Company having Name Star India so I think Star Brand will continue.