Yes there should be no problem going back to exclusive again if you should regret it. There are at least 1 site I can think of that you need to wait 30 days before your tracks are removed but most sites you can remove files instantly as far as I remember.
It’s sad that such great authors as you guys (and many others) are being forced to jump of the exclusive deal. But I think in most cases this is the only sane thing to do at the moment, IMHO. That way you can at least try for yourself what might come out of it. I would at least wait 6 months or preferably 12 months before judging if it was a good move or not, because getting traction for tracks on other sites is usually very different then on AJ.
I have several tracks that have started to gain traction after a year at least. Non exclusivity is the only reason I still have stock music as my main income. There are also other possibilities if you look at more Film and TV oriented libraries, might be an idea to remove an “album” or 2 and try that as well.
I have some small hopes that the new Envato CEO would eventually do some healthy sustainable changes around here, BUT I would not count on it.
On a bright note, competition sites are very lucky to get such great portfolios as yours in their catalogue that’s for sure.
I also think you can EASILY compensate for lost commission by raising your prices @WormwoodMusic !