Nice group shot around the car, with surprisingly even distribution of light at different distances.
I don't think the SB-5000 will be Nikon's last flash ("latest" may be correct), even though they've started to help two third-party flash manufacturers (Profoto and Nissin) interface with their cameras in a better way. IMO the SB-5000 is in several ways a better flash than the Profoto A1 which I have briefly shot with a couple of times. (A10 is their latest model in the series, but I haven't seen it yet.) The A1 was sufficiently tall and heavy to make it awkward to use on smaller cameras, whereas the SB-5000 is more compact than its predecessor (SB-910) and closer in size to the SB-800 which many people favoured. When using the flash on-camera, a smaller unit doesn't throw off the balance as much and is more comfortable to shoot with. The A1's turning head didn't stay in position if using their own purpose-made modifier (I think it was Soft Bounce); it flops and the modifier can fall off. For a 1k€ flash, this should not be happening. It also didn't allow one to specify TTL/M mode for each group independently like Nikon do. This is another big deal, as usually multiple TTL groups is a recipe for chaos and I would usually want to set the secondary remote groups on manual and primary flash on TTL. Not possible with the A1's. While the A1 and the current A10 are more powerful than the SB-5000, the cost is even higher than the power would suggest, and the fully featured remote is priced through the moon. I don't like Profoto's monolights because they don't offer a bare-bulb design, only forward-directed flash which would not fill large modifiers evenly, so basically everything would need to change from what I use for larger flash (Elinchrom). I am not saying Profoto is not good, but their products some significant design flaws and are very expensive. Retaining of the previous TTL metering result for flash when switching to M mode is elegant, and the Profoto units seem to be very reliable in firing when requested.
I don't know anything about Nissin flashes so can't really comment on them.
IMO Nikon should continue making and developing their own flashes. Nikon must have lost a lot of their flash market share by dragging their feet on radio remote controlled flashes but the one they did put out (SB-5000) is very good, and highly reliable in my experience. They should offer a hot-shoe alternative to the WR-R10 with a panel that is directly accessible instead of having to go through multiple button presses to get to as is required in the current radio AWL system. One can program a shortcut to it but then one has to use a function button for that (which could be used for other purposes). A direct access to each flash group's energy setting and TTL FEC on the controller would be ideal. The WR-R10 is too vulnerable especially when mounted on the side of the camera (such as in most of the mid-grade Nikon cameras now). I can see why they wanted to keep the hot shoe free of the radio controller in order to make it easier to mix with the older flashes of the optical system (now one can pretty much freely combine and control the two kinds), but I don't see how anyone would really want to use optical remotes when radio is available.