Yes. Servers in our network are on-line non-stop since the same day GameSpy went down (so for us Crysis MP was always up and ready to play). So what do you mean by "when the servers were still online" ? :) I'm sure you were thing about GameSpy's servers.
It's been almost 5 years now in this network (will be in July) - and most of the time there were always payers every day during that period - and you will still find players in the evenings nowadays. You can see today - there are 10 players already.
Especially on weekends - sometimes even 15-20 players on one PS server or around 7-8 on IA. Some people are out for few weeks or months sometimes - but they always come back in free time to visit this amazing multiplayer ;) It's been like that for 5 years so don't worry about the future. You can take a break and return after a while - it will be waiting for you :)
Anyway - good luck and enjoy the fun. There are always enough players to have fun in Crysis. If you see just 2-3 on server - join and others will do the same. All depends on you though. Have fun ;)