Not with 7 devices. That's the number of cords I'm counting in the picture although I'm only seeing 5 devices. Even 5 would be more than a dynamo could handle.

On a side note, wouldn't it just be better to cut down on the number of devices that need power? For example, I've never found the need for a whole lot of lighting while touring. Occasionally, I run across a tunnel but an alkaline battery powered tail light and an alkaline battery powered headlight are sufficient for those needs. A Petzl Zipka, for example works well for those midnight trips to the bathroom or for the occasional short tunnel. It lasts a very long time. I've used it on at least 2 tours a couple of years apart and it's still got power left. I would use it for day to day commuting but for the occasional use, it makes sense and I don't have to charge it.

I do use alkaline powered tail lights on my regular commute...actually several. In flash mode, the lights last a couple of years while using them 3 to 4 times per week for 7 to 8 months of the year. Granted I only use them for 2 hours per day 3 months of the year but they still last a very long time. I have a couple that I use on steady mode that will last an entire winter commuting season. And that's even when stored in an unheated garage. It's nice to use rechargeables but, honestly, with as long as an alkaline lasts in a taillight, it's just not worth the extra hassle.