Not to be a wet blanket but I don't think the 'Pod landing' cliffhanger is particularly suitable for the movie. Now, if this was an animated/CGI movie aimed specifically at the fans, then maybe. These are just a few reasons why:
1. As it is live-action, having any of the Saiyans appear at the end would mean they have to already cast an actor for the role, which adds a whole load of potential complications and risks that comes with adding another actor's timetable to the list that needs to be juggled for a sequel.
2. While fans would recognize what's happening, those unfamiliar with the property would be left confused. If you look at cliffhangers used in other movies, they're normally not important plot-wise or don't necessarily directly tie into the next movie.
3. It would mean they have to commit to how they're going to make DB2 without even having a script or general outline to it. They would have to decide at this point whether they want to have Radditz appear first or with Vegeta or to skip him altogether. Not showing the Saiyans arriving would leave all avenues open.
4. It doesn't give the movie a sense of resolution, which often isn't a good thing to do. This is especially so when a sequel isn't certain.
Hence, I think having Piccolo appear alive at the end, swearing vengeance against Goku would make a better cliffhanger.