Salvete;
To continue the thread of the former topic started by Camillus.
Actually, I think living Latin, if it is ever to live outside of academic circles, will inevitably evolve. However, I have a few remarks regarding this:
1. I think it's unlikely that we will ever speak Latin with one another. An ex-member of ours, L. Silvanius Florus, told he wanted to have a Latin-speaking household. It's an interesting experiment but I wonder if it worked / is going to work. It's actually very difficult to try and speak Latin if there's no one to speak it with on a regular basis. In high school, by the way, Latin was taught passively, meaning Latin --> Dutch and not Dutch --> Latin because we didn't need it.
2. If we speak Latin I think we should really depart from correct, academic Latin. By this I mean no muddling and mixing of cases, verb conjugations or pronunciation mistakes. Of course the lower classes of the Roman population spoke (and wrote?) Latin which many academics would consider wrong but was probably closer to everyday speech and interaction. However, one should take in account that there are always differences between language standards and the actual speech of the ordinary man (this also holds true for modern languages... if I tried to write Scots English it would probably be considered wrong). Secondly, we don't actually know what "ordinary Latin" really was like. We have most information about academic, literary Latin so we should really go with that.
That's my opinion in a nutshell .
Valete!
Draco