I've no issues with things ending so to speak and as said above, the 5 movie arc worked well for me, much like Nolan's Batman trilogy.
If the next Bond goes along the same lines then I'll be happy with that.
Having thought a little more about it, I'd say NTTD was pretty much a tribute to the franchise with all of the nods to previous movies. From the use of the score, the iconic vehicles and the little visual cues like the portraits of the various M's and the shot of Bond in the tunnel mimicking the classic intro. It's just another thing that makes me think that we'll see a rebooted Bond next outing.