This could work too yeah. I basically see Alear as inevitable. The rumors of Engage where always coupled with a FE4 remake, frankly I don't see Sigurd make it before Alear. But since Sigurd is quite a sigfinicant Emblem (used by the mother of Alear) him being coupled with Alear seems likely. Leaf too maybe? And Lyn cause of popularity, tho I could see her being a newcomer on her own too.
Still, another version of Alear could also happen but that one is spoilers heavy.
Also about Engage being "worth" getting... well depends on your tastes? It's far less story heavy than Three Houses, has one straight path, and focuses more on FE fundamentals and new gimmicks as Emblems and breaking. Gameplay wise I see yes definitely worth it. If you look for a deep story like Three Houses / Path of Radiance / Radiant Dawn, maybe not. The story is real straightforward, characters aren't as deeply fleshed out as Three Houses, but you'll love it regardless if you're a big fan of the series as it's a sort of celebration of Fire Emblem as a series.
I don't really get where the idea that Alear is inevitable comes from. Unless the next Smash development start in the next few months or as already started last year, I actually think his chances are very low. Here's a quote from Sakurai on the topic of Robin and Lucina in Smash 4:
"Industry trends around the time when development begins is a pretty big factor. I started development on
Smash for 3DS/ Wii U right after I’d wrapped up
Kid Icarus: Uprising, and
Fire Emblem Awakening was released one month after
Uprising. So what’s popular around the time when I begin designing the game is important." (...) " For example, if
Awakening was released six months later, Robin may not have made it in, and if it was six months early, they might not have even been considered."
Timing is very important for Smash characters, and it's especially important for Fire emblem because it's not a huge franchise by any means. Fire emblem was always very lucky with Smash bros development timing (Roy's game releasing soon after Melee, Awakening just released right at the time SMash 4 started development, Fates released at the time they were deciding Smash 4 DLC characters and Three houses was in development also when they were deciding Ultimate DLC characters. Now let's say Smash 6 starts development next years, would Alear be seriously considered? I doubt it, even Sakurai admits that a 6 months difference for Awakening could have mean that Robin wouldn't even have been considered. Personally I think's Alear chances are very low unless the game has already started development (which would surprise me a lot).
Here's the source by the way for the quotes
Source gaming
If we were to get another fighting game character I have a few choices in mind:
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All of these four would be pretty nice!
My most wanted fighting game characters would be Scorpion from Mortal kombat, Kage Maru from Virtua fighter and Nakoruru from Samurai Shodown.
