Beginning of the season, when talking about why they chose their FD music, it sounded pretty much like this was their last season.
Regarding DavSmo switching, I don't think they would be on the US 4CCs team - in non-Olympic years we usually send the A squad to that, so it will be ChoBat, HawBak and GrePar, or maybe CarPon if they can get back on track and challenge HawBak and GrePar. DavSmo soundly beat both BraSom and PateBye at CS Austria, and also beat PateBye by a solid margin at US Classic. They're certainly ahead of both of those teams (and WolfChen too). My expectation is they would slot in at US #5 - but I also think the race behind ChoBat from 2-8 is very fluid and can easily change with different material from each team as well as coaching changes, etc. The question is, would DavSmo want to settle in to that fight or just wait out the Russian sanctions (which might very well last more than a year, possibly even this entire Olympic cycle)? If they want to compete and the sanctions look lengthy, they will switch, mark my words.
I don't believe MorNar will switch to the US. They might wind up training here but she also has French citizenship and he is Ukrainian by birth, so they have at least 2 other options. France has 3 spots for Worlds next year. Lopareva/Brissaud are certainly getting one of those spots and they have some talented young teams, but there is certainly an opportunity, should MorNar make the switch. And, honestly, I would if I were them because there are some really good junior teams coming up in Russia and there is no guarantee they'll be top 3 in Russia, especially if StepBuk and ZagGuer continue and DavSmo don't switch.