[Speed-King]

I think a lot depends on how quick and on what level the economy picks up again: If we go back to the grwoth rates we had before the crash, the current crisis of the ALMS might only be a slight hickup, but if we only see a slow recovery this might do the series in.

And then, there's of course the question of long term viability: experts say, that we'll see less, but bigger car companies in the future as the existing ones merge with their rivals or simply shut down.
Now, most companies don't like it, if their brands race eachother, so the number of potentially 'available' manufacturers decreases. For a series as dependent on manufacturer-participation as the ALMS, this already is a problem and will only get worse in years to come. Relying on manufacturers has always been problematic, but with fewer brands and companies this will only get worse in the future.
The ACO's Intercontinental Cup doesn't make things any better, of course.

So overall, I think, that after ten years, time might be ripe again for another revolution in North American sportscar racing, especially considering how the rival series Grand Am and especially Speed World Challenge aren't exactly betted on roses right now, either...
The next two or three years will probably be VERY interesting.