MMO games have been in development for 20 years now, so obviously more than 10 players lag-free will be do-able on the worlds most modern advanced servers that could now be classed as hyper super computers compared to single-shard/server game worlds of the now ancient MMO servers of the 2000's MMO games.
You say - "They won't manage to pull most of them at a level already established by other games imo."
Why?
Such games were doing it (one maybe two game modes?) EASILY over 10 years ago - even after their own release dates. Technology and coding optimisation has changed vastly since then.
"SC won't come near Eve when it comes to fleet battles, its flight model and procedural generation pales compared to ED"
Eve has... extremely "bad" graphics during fleet battles, so if CIG really have to then they could do just that - IF it came to it during huge fleet battles. EVE uses old coding and server technologies, SC is a completely fresh game, so if CIG can't do it then no one will.
As for ED, come on, that game is pretty much still just a dogfighter game with an adventure/exploration mode stamp on it, and they released the game early based on the game purely being just a dogfighter game - nothing else. ED is exactly what SC would have been and a direct competitor for players between the two games.
As for the rest of your message, sure those things are yet to be seen. Just keep in mind that CIG basically bought-out the guys behind who built its game engine so they can modify it to literally no end of possibilities without having to rebuild their game for an entire new engine just to keep pace with prettier and faster pixels - as more or less seen by EVE and WoW.