Ramos already had a verbal agreement with Sevilla, he is going back there at the moment. I think it is quite good and important to make sure that we are going to end up with something different, it should be important to realize that Ramos will not accept to go towards teams like that just yet, he wants to play a bit more at teams that matter.
Sevilla is a good one at that, they are both at La Liga and they are also in the UCL as well, which gives him chance to play at the top flight a bit more. Doesn't mean they will do well, but it is better than Saudi or MLS situation for him, it still gives him chance to go against the best in the world and try his luck. It could definitely be a good thing for him to do that for a year more.
I think he made the right decision in moving to his former club than moving over to the MLS or Saudi league, well he's had a good time playing European football and has many trophies to show for it, he's a great player and would forever be in the heart of Realmadrid fans, that's the club he was most successful in a had quite a lot of experience with the team, anyways moving to Sevilla would be of benefit cause he'll have the chance to play champions league football again.
But his current team are underperforming this season and are currently at the bottom of the table, so they'll definitely need an experienced player like Ramos to help restore a balance to their defence line, and since he's a defender that moves forward and is capable of scoring goals he'll definitely be of help for them during corners and set pieces to get the ball into the net.