The only advantage of a smaller camera is that you are more likely to have it with you. Otherwise the DSLR will take the pictures you describe better than a small sensor camera – period. It will focus, shoot and cycle faster. You can crank the ISO up at least as well as ANY small sensor and much better than most, and you have the added advantage of stabilization with the high ISO. You can see what you are shooting better and have much better versatility. You can shoot in full auto or do things like blur the backgrounds in portraits using more advanced controls.
If portability isn't a problem stick with what you have.