"but Riot isn't running a charity here"
Riot have no interest in partnering the "best" team, as I said, you can pick any team you want you will always have a 1st and 12th, whatever team you pick. If I would be fully cynical I would say if you are Riot, you rather see Sentinel win, than a no hype structure like GX win, wish mean if you have a choice between 2 structure without hype, you better pick the worst so you increase the chance of Sentinels to go in final and bring the viewers. (I don't think Riot would do that anyway even if it would be the most "efficient" thing to do.
"versus fielding a roster that gets 13-2'd and 13-3'd every single match."
That wont happen https://www.vlr.gg/399723, as you can see they didnt get 13-2 against NS, sure they get 2-0 but thats not the 26-5 you expected, and keep in mind thoose player play their soloQ on SA server, if they were in T1 they would be mush stronger because they would have access to a way better soloQ
(PS : another good series against a team that went to T1 https://www.vlr.gg/222700 )
"You're talking about "bombing for a few years" but what if Riot doesn't give GE those few years?"
Then they are dumb as fuck, they didn't pick GE because they though they were competitive, they pick GE because they access to Indian market, and if they drop GE thats only because they don't manage to access to it. Look at what they are today, did GE ever access to playoffs in 3 years ? They already semi-bombed, no playoffs, best result in 3 years top 8... If that's the result that lead Riot to keep or drop a team GE is already dead, at least with a full Indian roster they would have excuses.
"The reality is GE needs to stay competitive enough to keep their franchise spot first."
Wish they can't if the only roster they can do is with SEA leftover and KR leftover, why join GE if you can join T1, GEN, DRX, why join GE if you can join a full PH roster, or a full TH roster ? Leftover esport will never be competitive. You have way more chance to get drop by Riot if you don't represent the region you are supposed to represent and still do bad result and think only short-term-wise, than if you aim at long term try to develop your region and also do bad. And if you are Riot you will surely prefer the latter because you know India will be the next China.
Mixed roster could be a compromise, 3-IN, 2-inter is good