Reissues are for enthusiasts. Plenty of WIS enthusiasm for Heuer. Not so much for Tag Heuer! This came from the 80s, when TAG was busy overhauling the collection and marketing quartz fashion watches.
A reissue also needs a good story and some nostalgia behind it I guess. Like how Jack Heuer came up with the Carrera. Or how Steve McQueen wore the Monaco. Or how Siffert sold Autavias in the pitlane. Senna provides a character but not really a story about the watch. Is it enough? There's also the problem that many watches have already been released with "Senna" on the dial and elements of the design (like the Link bracelet).
Finally, a reissue needs to have a timeless design that still works and is appreciated today. The S/EL isn't the most beautiful and simple of pieces to be fair, which I wouldn't call a "classic". Of course 1980s has it's own charm, but maybe it just wasn't as good as 1960s design?!
EDIT: I forgot the name doesn't help much either. Carrera, Autavia, Monaco, Monza. And S/EL. Does anyone (apart from us) even know that it stands for sports elegance? Sounds like a clothing line that Alan Partridge would model.