I'm someone who started out playing just one thing... and then slowly, literally over the better part of a decade now, have started to branch out.

In general, I tend to follow the tendency across other games - I'm definitely someone who prefers to specialize and go very in depth within that specialization.

So, yes, you can definitely do it. There's merits to diversity as well, but... my vote would be for you to just keep playing DNC and if/when curiosity or some other motive makes you eventually want to try other stuff, then by all means do so - but IMO, don't do it because it feels like an obligation.