For starters you need have the understanding that solo games are not popular anymore.
League of legends semifinals peaked out at 1million concurrent viewers. They have played the same freakin map for 9 years. Their streamer directories are poppin’
CSGO tournaments still peak out at around 700,000 viewers concurrently. Their streamer directories are poppin’
Hearthstone is doing fine, but that’s natural because card games have been around for a millenia.
Where did LOL get their idea from? Something you never bothered to capitalize on —> WC3’s DOTA.
I don’t think it takes a rocket scientist to figure out that the success of games these days are centralized around team play. That being said here’s what I think you should do, if you do decide to go with SC3 ( which I would very much like to see )
Make the next RTS revolve around team games. You’ve had plenty of time to figure out that people are not interested in starcraft 1v1, so I think it’s time to explore a new avenue.
To be frank, I think you already shot this genre in the foot with your negligence and lack of understanding of the evolution of esports, but then again no one else of your stature has even tried to venture down that path.
I have 50,000 followers on Twitch, playing a very unpopular game-type so I’m relatively certain that there are plenty of people out there that would give it a chance.