Change equals strife. So I say embrace that change and enjoy it! Now how does that pertain to the way you train? Well I am not saying run out and learn an RBSD system if you do not want to but instead look at how they do thing's as a chance to be more educated yourself in the Martial Sciences. Just like if you practice a RBSD system or MMA, etc. look at how TMA's work and the principles and concepts that they use. Who knows you may learn, grow and change!
In the end we all need to be flexible!