Stuff like a better event search, or cloud-compile could had been implemented in C2 without much stress.
And Ashley already said that C2 has reached maturity (or something like that), so yeah ... in my opinion, it will only receive bug fixes and minor features.
But on the other hand, you still can use C2 without subscription, so is something
And if C3 subscriptions will not reach the anticipated results, maybe give C2 access to cloud-compile (for a price of course).
We even have users that come here to inform us about other software.
I don't think people are going to leave because Scirra introduces an engine designed for hardcore mobile game designers.
Are we talking about the same engine that has questionable performance on mobile devices and lots of issues ? (sound, black screen, plugins not compatible with wrapper... etc). And don't forget to "optimize"
Don't know what was the leave rate anticipated by Scirra Team, but I can bet that more then half of the current users will leave for another engine.
There are still issues with C2 and the website, forum and arcade that should also be addressed and fixed before a big rollout and they are working on those issues.
Hope they will be better prepared when C3 will go live.
As for C3... Well, Stencyl, Gamesalad and BuildBox have subscriptions and are still going, so there is place for C3, only not with the current userbase.
But don't forget that the engines mentioned before have a showcase with games that were very popular, I can't say the same for C2/C3