I genuinely liked Siuan and Moiraine together but it felt like token representation. Sophie absolutely knocked it out of the park, even the 'my world' speech -which was totally contrary to Siuan's character. I didn't like Thom and Moiraine in the books. Siuan and Gareth worked as a pairing and it would be a shame to lose that. I suspect that Nynaeve will heal Moiraine instead of Siuan, which was another incredible moment in the books. I wouldn't be surprised if Siuan is killed in the tower coup.
I know people want to see people like them on TV and I don't think its right to demonize those feelings; it needs to be in proportion though.