Lol you don't even have to look at the fan reaction to know that the jury vote will be astronomical and the televote will be literal vapor. It's written in the stars, a tale as old as time. France's obstacle will be improving these odds without being Italy (as only Italy's flippin' halo effect could carry this into a top five). Barring that it will come lower left-hand-side, a decent result for France and that will be the end of it.
I'm french and i would totally live with a left-hand side of the scoreboard result between 10th and 13th. We basically have a subscription in the middle of the ranking every year, with some Top 5 or Bottom 5 sometimes but still rare. So it won't change nothing for us.
I personnally believe this is a smart choice from the delegation to go for a confirmed artist like Slimane, very popular in France (important after La Zarra disaster) and choose for him a song relying mostly on the vocals because you know that you might have a serious chance to get a good jury score. It's maybe more boring for the fans but the delegation want to secure a good result by choosing a jury bait song. People here in France mostly like him and won't care that much if televote tank us. People will only see the final result.
Of course you never have the assurance it will work in the jury too but that's the game. However I don't see here an "astronomical" jury score for Slimane but 6th/7th place at the juries result looks possible (depending on the competition). Televote won't be literal vapor too. With his interpretation and live performance he will elevate it a lot and grab the attention of people. It will be, i think, enough to gather some points, like 25/30 points, but not 0. Overall he might do an Alika kind of result or slightly lower.
Why i also think it's smart is because it might encourage other big artists to participate if Slimane gets a great overall score, because he's by far the biggest artist we've sent in Eurovision in a long time. So in the end even if it's not a big televote win for France in Malmo, his participation could be very positive for the future of France in the contest. I truly believe it's a pivotal year for us.
Going back on the jury vote, i don't to overhype myself here too. La Zarra was promised to a Top 3 in the juries during the rehearsals and in the end flopped, reaching only a 16th place. So let's wait. Slimane surely has much more arguments than La Zarra, starting with his voice, interpretation and experience on the stage, to do much better in the juries but we never know.